# The Definitive Ranking: Best Aquarium Plant Fertilisers That Actually Work
Right, so we finally sat down and hashed this out. Took us four sessions, three heated debates about liquid carbon, and Bobby nearly walking out when we started discussing DIY root tabs versus commercial ones. But here it is: our definitive ranking of the fertilisers that actually matter in planted tanks.
We kept this practical. No boutique brands you can’t get without importing. No theoretical perfect ratios that only work if you’ve got laboratory conditions. Just the fertilisers that real people use in real tanks with real results. We’re talking about what’s available in the UK, what works across different setups from low tech community tanks to high tech CO2 systems, and what delivers proper value for money.
Samuel kicked off by insisting we had to include liquid carbon, which immediately got Roger rolling his eyes and muttering about marketing nonsense. Juan wanted everything evaluated on a cost per dose basis, which is fair but doesn’t tell the whole story when some fertilisers simply work better. Billy kept pushing back whenever we got too focused on high tech setups, pointing out that most people don’t run CO2 systems and daily dosing schedules.
The criteria ended up being effectiveness across different tank types, availability and cost in the UK market, ease of use for actual hobbyists, and proven track records from years of community use. We excluded anything that requires a chemistry degree to dose properly and anything that’s only suited to one very specific type of setup.
The surprises? How high some of the newer all in ones ranked once we really looked at the numbers. How much disagreement there was about whether Seachem still deserves its reputation. And how passionate Bobby gets about DIY solutions that cost a fraction of commercial alternatives.
## **1. APT Complete**
**All-in-One Fertiliser | High-Tech Focused**
500 mL treats 10,000L at recommended dosing • 4.6/5 stars on Amazon • Launched in 2019 as part of revolutionary APT system • Specifically designed for CO2-injected tanks • Daily dosing protocol
**What makes it untouchable**
This one was unanimous, which almost never happens. APT Complete changed how people think about dosing entirely. The 3.38% nitrate, 0.31% phosphate, and 3.9% potassium ratios (Billy’s full breakdown here) aren’t just random numbers. They’re based on actual plant uptake ratios in high light, CO2 injected systems.
Roger’s been running APT Complete for two years now and reckons it’s the first all in one that actually works as advertised. “The daily dosing sounds like a pain until you realise you’re not constantly fighting algae because your nutrients are always available when the plants need them.” Juan pointed out the cost effectiveness too. At one pump per 20L daily, that 500ml bottle treats 10,000L of tank water. Work that out per dose and it’s competitive with mixing your own dry salts.
Samuel was initially sceptical about the daily dosing, but his 240L high tech setup hasn’t had a single algae outbreak since switching from weekly dosing. The micronutrient profile includes 0.13% iron and 0.29% magnesium, which handles the trace elements that cause problems when they run low between doses.
**Does it still hold up?**
It’s still the gold standard for CO2 systems, but that’s also its limitation. This is specifically formulated for high tech setups with good lighting and CO2 injection. Try running this on a low tech tank and you’re asking for trouble. The daily dosing requirement puts some people off, though honestly, once you’re in the routine it takes thirty seconds. The price point isn’t budget friendly, but when you work out the actual cost per dose it’s reasonable for what you’re getting.
## **2. Easy Green**
**All-in-One Fertiliser | Beginner Friendly**
4.8/5 stars on Amazon with 2000+ reviews • 500 mL treats 5,000 gallons at standard dosing • Launched 2018 • One pump per 10 gallons weekly protocol • Most reviewed fertiliser in the US market
**What makes it untouchable**
Samuel championed this one hard, and for good reason. Easy Green gets planted tanks right for people who don’t want to become chemists. The 3% nitrogen, 0.3% phosphate, 3% potassium ratios work across low tech and moderate tech setups without causing problems. More importantly, the dosing is genuinely easy. One pump per 10 gallons weekly. That’s it.
The community response backs this up. Over 2000 reviews on the product page, 4.8 out of 5 stars on Amazon, and you’ll find Easy Green mentioned in every planted tank forum. Billy pointed out that Aquarium Co-Op launched this in 2018 and it immediately became their bestseller because it actually works the way they say it does. Samuel’s detailed review covers why the phosphate derived from potassium phosphate makes such a difference to plant uptake.
Roger was initially resistant to anything with “easy” in the name, but admitted after trying it that the 0.13% iron content stays available longer than expected, and the weekly dosing schedule fits how most people actually maintain their tanks.
**Does it still hold up?**
Still the best entry point into proper plant nutrition. The weakness is scalability. It works brilliantly up to moderate lighting levels, but push into high tech CO2 territory and you’ll need more frequent dosing or additional supplements. The price per dose is higher than mixing your own, but for the convenience factor it’s worth it. Bobby grumbled about people paying for convenience, but even he admits it’s properly formulated.
## **3. NilocG Thrive**
**All-in-One Fertiliser | Hobbyist-Developed**
Founded by hobbyist in 2012 rather than corporation • 4.7/5 stars on Amazon • 500 mL treats 2,500 gallons at standard dosing • Available in separate ThriveC low-tech formula • Iron chelated with DTPA for stability
**What makes it untouchable**
Billy made the case that this deserved the third spot because it came from actual fishkeeping experience, not a corporate lab. NilocG was founded by a hobbyist in 2012, and you can tell. The 2.5% nitrogen, 9% potassium, 0.46% iron formulation works because it was developed by someone running actual tanks, not someone reading research papers.
The Amazon rating of 4.7 out of 5 stars tells the story, but what sealed it for us was the flexibility. Billy’s analysis shows how the standard Thrive handles moderate to high tech setups, while ThriveC covers low tech tanks without CO2. Most companies make you buy separate macro and micro bottles. NilocG gives you options that actually match how people set up tanks.
Juan appreciated that the iron is chelated with DTPA, which keeps it available longer than cheaper chelation methods. Roger noted that the recommended 1-2 pumps per 10 gallons weekly gives you dosing flexibility based on your setup rather than a one size fits all approach.
**Does it still hold up?**
The hobbyist origins show in good ways and occasionally limiting ones. It’s properly formulated for real world conditions, but the brand awareness isn’t there yet compared to Seachem or Tropica. The dosing flexibility is excellent, though some people get confused by having options rather than a single protocol. Quality wise, it’s as good as anything else in this ranking.
## **4. Tropica Premium Nutrition**
**All-in-One Fertiliser | European Low-Tech System**
Part of established Tropica 90-day system • 4.5/5 stars on Amazon • 250 mL treats approximately 2,000L • Specifically designed for tanks without CO2 • 6 mL per 50L weekly dosing protocol
**What makes it untouchable**
This sparked our biggest argument. Juan and Billy both wrote about it, and they disagreed on almost everything except that it works. The 0.8% nitrogen, 0.1% phosphorus, 1.3% potassium ratios are deliberately conservative because it’s designed for low tech tanks without CO2. The 6ml per 50L weekly dosing fits the Tropica 90 day system that includes substrate and regular water changes.
What convinced us it deserved this spot was the European track record. Billy’s take and Juan’s perspective both acknowledge that Tropica has been doing planted tanks since before most of us knew they existed. The Premium Nutrition formula is the result of decades of European aquascaping experience, not marketing department decisions.
Bobby pointed out that the 0.07% iron and 0.2% magnesium content handles micronutrients without the risk of overdosing that comes with stronger formulations. Samuel was initially sceptical about the low phosphorus content, but admitted it prevents the algae problems that plague overfed low tech tanks.
**Does it still hold up?**
For low tech tanks, absolutely. The conservative ratios prevent problems rather than pushing growth, which is exactly what you want without CO2. The limitation is that it’s genuinely only for low tech setups. Try using this with high lighting and CO2 and your plants will show deficiencies quickly. The price per dose is higher than mixing your own, but reasonable for the European quality standards.
## **5. Osmocote Root Tabs DIY**
**Root Fertiliser | Budget DIY Solution**
15-9-12 NPK ratio from terrestrial plant fertiliser • 6-month controlled release formula • 4.7/5 stars on Amazon • 00 gelatin capsules hold ~735mg powder • 2 lb container covers 75 sq ft terrestrial use
**What makes it untouchable**
Bobby’s passion project made the list despite Samuel’s protests about recommending terrestrial fertiliser for aquariums. The case is simple: Osmocote Plus 15-9-12 NPK with 0.46% iron and micronutrients including 0.02% boron and 0.05% copper provides exactly what root feeding plants need. Fill 00 gelatin capsules with the granules, push them into the substrate around heavy root feeders, and they release nutrients for up to 180 days.
The cost argument is overwhelming. Bobby’s breakdown shows you can make hundreds of root tabs for the cost of a single pack of commercial ones. The controlled release formula prevents the nutrient spikes that cause algae problems, and the 4.7 out of 5 star rating on Amazon proves terrestrial plant growers have been using this successfully for years.
Roger was concerned about aquatic safety until he researched the actual composition. It’s the same nutrients as commercial root tabs, just in a terrestrial fertiliser format. Juan appreciated that you can adjust the dosing by varying how much goes into each capsule.
**Does it still hold up?**
For root feeding plants like swords and crypts, this is still the most cost effective solution. The DIY aspect puts some people off, and there’s always the concern about using terrestrial products in aquariums. But the chemistry is sound, the results are proven, and the cost savings are undeniable. Commercial root tab manufacturers hate this one simple trick, as they say.
## **6. Seachem Root Tabs**
**Root Fertiliser | Commercial Premium Option**
4.6/5 stars on Amazon UK • Each tab weighs 7g • One tab per 10-15cm radius every 3 months • 0.8% iron content • 0.28% available phosphate for root uptake
**What makes it untouchable**
Billy argued these deserved a higher spot based on reliability and ease of use. The 0.28% phosphate, 0.16% potash, 0.8% iron, plus micronutrients including 0.11% magnesium create a proper nutrient profile for root feeders. Each 7g tab covers a 10-15cm radius for three months, which makes dosing straightforward.
The commercial advantage is consistency. Every tab has the same nutrient content, they dissolve at the expected rate, and you know exactly what you’re putting in your tank. Billy’s review covers how the 4.6 out of 5 star Amazon rating reflects genuine user satisfaction rather than marketing hype.
Bobby remained convinced his Osmocote DIY approach is better value, but admitted the commercial tabs remove any guesswork about composition or dosing. Samuel liked that they’re specifically formulated for aquatic use rather than adapted from terrestrial products.
**Does it still hold up?**
For people who want commercial reliability and don’t mind paying for convenience, absolutely. The nutrient profile works, the dosing is simple, and you’re not experimenting with terrestrial fertilisers in your fish tank. The cost per tab is significantly higher than DIY alternatives, but some people prefer paying for guaranteed results.
## **7. Flourish Excel**
**Liquid Carbon | Controversial Alternative**
4.6/5 stars on Amazon UK • 500 mL treats 20,000L at maintenance dosing • Introduced early 2000s as CO2 alternative • Contains 1.5% polycycloglutaracetal • Daily dosing protocol for consistent results
**What makes it untouchable**
This caused our longest debate. Samuel insisted liquid carbon deserved inclusion because it’s the only practical CO2 alternative for people who can’t or won’t inject gas. The 1.5% polycycloglutaracetal provides carbon that plants can actually use, and the maintenance dose of 5ml per 200L daily is manageable for most setups.
Roger spent half his article arguing it’s not actually liquid carbon, which is technically true but misses the point. His analysis acknowledges that despite the chemistry debate, Excel does improve plant growth in non-CO2 systems. The 4.6 out of 5 stars on Amazon and decades of community use prove it works, even if we don’t fully understand how.
The algae control properties sealed the deal. Excel doesn’t just feed plants, it actively suppresses certain algae types. Juan pointed out this dual function makes it valuable even in some CO2 systems for algae management.
**Does it still hold up?**
For non-CO2 tanks that need better plant growth, yes. The daily dosing requirement and cost add up quickly in larger tanks. The algae control benefits remain relevant, though you need to be careful with sensitive plants like Vallisneria. It’s not actually liquid CO2, but for many people it’s the only practical alternative to gas injection.
## **8. Fertiliser Dosing Schedules**
**Knowledge Base | Understanding Over Following Labels**
Estimative Index recommends 20-30 ppm nitrate weekly • CO2 tanks consume nutrients 2-3 times faster • ADA system based on daily dosing protocols • Tropica uses weekly macro approach • Iron deficiency visible below 0.1 ppm
**What makes it untouchable**
Roger’s argument was that understanding dosing matters more than any specific product. The Estimative Index recommends 20-30 ppm nitrate, 3-5 ppm phosphate, 20-30 ppm potassium weekly with 50% water changes. ADA uses daily dosing for high light tanks. Tropica bases their system on weekly macros. These aren’t random numbers.
Roger’s deep dive shows why following bottle instructions often fails. CO2 injected tanks consume nutrients 2-3 times faster than low tech setups. A fertiliser dosed weekly in a non-CO2 tank might need daily dosing with CO2 injection. Understanding these relationships prevents more problems than any specific product solves.
Billy was initially resistant to including knowledge rather than products, but agreed after seeing how many people dose incorrectly because they never learned the underlying principles. Juan appreciated that understanding the numbers lets you adjust any fertiliser to your specific setup rather than hoping the manufacturer’s assumptions match your tank.
**Does it still hold up?**
More than ever. The hobby keeps producing new fertiliser brands with different ratios and dosing schedules, but the fundamental relationships between light, CO2, and nutrients remain constant. Understanding why iron deficiency appears below 0.1 ppm or why nitrate deficiency occurs below 5 ppm helps regardless of which brand you’re using.
## **9. Seachem Flourish**
**Trace Element Supplement | The Old Reliable**
4.7/5 stars on Amazon UK • 250 mL treats 12,500L at standard dosing • Contains comprehensive micronutrient profile • 0.07% potash plus 7 trace elements • Recommended 5 mL per 250L weekly or bi-weekly
**What makes it untouchable**
Billy defended Seachem’s flagship against our collective scepticism. The 0.07% potash, 0.0118% magnesium, plus trace elements including 0.0001% copper, 0.00027% manganese, 0.00009% molybdenum, and 0.00016% zinc create a proper micronutrient profile. It’s not a complete fertiliser, but as a trace element supplement it’s properly formulated.
The track record speaks for itself. Billy’s assessment acknowledges this has been the standard micronutrient supplement for decades. The 4.7 out of 5 stars on Amazon UK reflects genuine user satisfaction, and the 250ml treating 12,500L makes it cost effective for what it does.
Roger pointed out that calling it a complete fertiliser is misleading since it has virtually no macronutrients, but as a micronutrient supplement for people mixing their own macros it serves a purpose. Samuel noted it works well alongside other fertilisers for covering trace elements.
**Does it still hold up?**
As a trace element supplement, yes. As a complete fertiliser, absolutely not. The micronutrient ratios are sound and it’s been proven reliable for decades. But expecting this alone to feed a planted tank will lead to disappointment. It’s a specialist product for a specific purpose, and when used correctly it still works.
## **10. Thrive Concentrated**
**All-in-One Fertiliser | Concentrated Formula**
Higher concentration than standard Thrive formula • Extended treatment capacity per bottle • Part of NilocG hobbyist-developed range • DTPA iron chelation for stability • Flexible dosing based on tank requirements
**What makes it untouchable**
Billy’s second NilocG entry made the list based on the concentrated formula addressing the main weakness of all-in-one fertilisers: dosing large tanks economically. The higher concentration means fewer pumps per dose and longer lasting bottles. His analysis shows how the concentrated approach reduces per-dose costs while maintaining the nutrient ratios that made standard Thrive successful.
The hobbyist development angle remains relevant. This isn’t a corporate decision to offer a stronger version, it’s a response to community feedback about dosing costs in larger systems. Juan appreciated that NilocG listened to actual users rather than just following market research.
Samuel was initially confused about having two Thrive variants in the ranking, but agreed the concentrated formula solves different problems than the standard version. For large tanks or heavy plant loads, the concentration advantage is genuine.
**Does it still hold up?**
For people running larger planted systems, the concentrated approach makes sense. The nutrient ratios remain sound, and the cost per dose improvement is significant in 200L+ tanks. The downside is less dosing flexibility for smaller systems where the standard formula might be more appropriate.
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## Almost Made the Cut
**APT Zero**: Juan pushed hard for this phosphate-free version, arguing it’s brilliant for tanks with phosphate issues. We came close, but it’s too specialised for a general ranking.
**Flourish Comprehensive**: Roger’s case was that it’s basically Flourish with actual macronutrients added. Good point, but it still doesn’t compete with proper all-in-ones for effectiveness.
**TNC Complete**: Bobby liked the UK focus and competitive pricing. Solid product, but not quite distinctive enough to crack the top ten against established names.
**DIY Dry Salt Mix**: Samuel wanted to include mixing your own from potassium nitrate, monopotassium phosphate, and traces. Cheapest option by far, but the complexity puts it beyond most hobbyists.
**Easy Carbon**: The liquid carbon alternative to Excel. Juan reckoned it’s essentially the same thing at lower cost, which is probably true, but Excel’s established track record won out.
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## Final Thoughts
Looking at this list, what strikes us is how much the hobby has moved toward all-in-one solutions that actually work. The top four spots go to complete fertilisers that deliver proper nutrition without requiring chemistry degrees. Even the root feeding options have moved toward simplicity, whether that’s commercial tabs or straightforward DIY approaches.
The liquid carbon debate will never be settled, but Excel earned its place because it solves a real problem for people who can’t inject CO2. The knowledge entry feels odd in a product ranking, but understanding dosing prevents more tank problems than any specific fertiliser solves.
What surprised us was how much agreement there was once we got past the initial arguments. These fertilisers work because they’re formulated based on what plants actually need, not marketing department decisions. They’re available when you need them, priced reasonably for what they deliver, and proven by years of community use.
Think we got it wrong? Yeah, probably on at least two of these. The liquid carbon placement will annoy people either way, and there’s always someone whose favourite didn’t make the cut. Let us know where we messed up.
