# Easy Green and the Aquarium Co Op Fertiliser That Simplified Everything I spent my first year of planted tanks mixing my own fertilisers. Had a spreadsheet, three different bottles, a measuring syringe that belonged in a chemistry lab. I’d calculated exact dosing rates based on tank volume and plant mass and light levels.
Very scientific, very precise, and absolutely exhausting. Then one of the other parents at school drop off mentioned this single bottle from Aquarium Co Op that just worked. I bought it to prove him wrong, frankly.
Turned out he was right, and I’ve been using it ever since. Easy Green isn’t revolutionary chemistry.
It’s an all in one liquid fertiliser that does exactly what it says on the bottle without any fuss.
What made it significant in the hobby was the timing and the approach. When it launched in 2018 (Aquarium Co Op Blog), most planted tank fertilisers were either expensive European imports or complicated multi part systems that required you to dose different bottles on different days. This was one bottle, one pump, once a week.
Done. The real genius was the dosing mechanism. That pump dispenser means you’re not measuring anything.
One pump per 10 gallons weekly (Aquarium Co Op) is the standard recommendation, but more importantly, it’s impossible to overdose catastrophically. I’ve watched my nine year old dose our 120 litre tank without supervision. She uses two pumps, which is slightly more than the calculation suggests, but it’s fine.
Everything keeps growing. | **Fertiliser Type** | **All-in-One Liquid** | | **Dosing** | **1 pump per 10 gallons weekly** | | **Bottle Size** | **500ml treats 5000 gallons** | | **Key Nutrients** | **3% N, 0.3% P, 3% K, 0.13% Fe** | | **Price Range** | **£15-20** | | **Our Rating** | **8.5/10** | ## The Background Story Aquarium Co Op built their reputation on practical fishkeeping advice rather than high tech solutions. Cory McElroy, the company founder, had been running the YouTube channel for years before they launched their own product line. The approach was always about making the hobby accessible rather than impressive.
When they decided to create a fertiliser, they weren’t trying to revolutionise plant nutrition science. They wanted something that would work for the average hobbyist without requiring a chemistry degree. The fertiliser market in 2018 was dominated by either expensive specialist brands or DIY solutions that required mixing multiple compounds.
Most all in one products were either underpowered or created algae problems when dosed at effective levels. Easy Green was formulated to hit the middle ground. Enough nutrients to support healthy plant growth in most setups, balanced ratios to avoid triggering algae blooms, and simple enough that someone could use it successfully on their first planted tank.
The timing mattered too. The planted tank hobby was growing rapidly, driven by social media and better LED lighting options, but the learning curve for fertilisation was putting people off. Too many newcomers were either starving their plants or creating green water disasters by overdosing.
Easy Green offered a safer middle path that actually worked for most scenarios. ## What Makes It Work The nutrient profile is deliberately moderate. Contains 3% nitrogen (Aquarium Co Op), 0.3% phosphate (Aquarium Co Op), and 3% potassium (Aquarium Co Op). Those aren’t aggressive numbers.
They’re conservative enough that you’re unlikely to trigger algae problems, but sufficient to support decent plant growth in most community tank setups. The iron content is listed as 0.13% (Aquarium Co Op), which is about right for maintaining plant colour without overdoing the micronutrients. I’ve used it in tanks with everything from basic java fern to red stem plants, and it keeps things looking healthy.
Not spectacular, but healthy. Sometimes that’s exactly what you need. What I appreciate most is the phosphate source.
It’s derived from potassium phosphate (Aquarium Co Op) rather than cheaper alternatives that can cause pH swings or leave residues. The formulation is clean, which means it doesn’t create the water quality issues that some budget fertilisers can cause. The dosing system removes most opportunities for error.
One pump delivers a consistent amount, and the recommended dose is 1 pump per 10 gallons weekly (Aquarium Co Op). No measuring, no calculations, no different bottles for different days. A 500ml bottle treats up to 5000 gallons at standard dosing (Aquarium Co Op), which means even heavy users are looking at months of supply from a single bottle.
In practical terms, this works for most low to medium tech planted tanks. By that I mean tanks with moderate lighting, possibly some CO2 supplementation, and plants that aren’t pushing maximum growth rates. It’s sufficient for the java ferns and anubias that most people start with, and it’ll support faster growing stems like hornwort and cabomba without creating problems.
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I’ve tested it in everything from a 40 litre shrimp setup to our main family tank, and the results are consistent. Plants stay green, growth rates are reasonable, and I don’t get algae blooms. The red plants don’t get intensely red, but they don’t go green either.
For most people, that’s exactly what success looks like. ## The Limitations It’s not a high performance fertiliser. If you’re running CO2 injection with intense lighting and trying to achieve competition level growth rates, Easy Green won’t cut it. The nutrient levels are too conservative for rapid growth scenarios.
You’d need something with higher nitrogen and phosphorus content, or a more complex dosing schedule that adjusts nutrients based on plant demand. The micronutrient profile is basic. Iron at 0.13% is adequate for general plant health, but it won’t give you the intense reds and purples that some aquascapers chase.
Plants like Rotala macrandra or Alternanthera reineckii need more comprehensive micronutrient supplementation to reach their full colour potential. Easy Green will keep them alive and reasonably healthy, but not spectacular. The one size fits all approach doesn’t account for different tank bioloads or plant masses.
A heavily planted tank with intense lighting needs more nutrients than a lightly planted community setup, but the dosing recommendations don’t differentiate. You can adjust by using more pumps, but then you’re back to calculating rather than following simple instructions. Some plant species are naturally heavy feeders that need root fertilisation as well as water column nutrients.
Cryptocoryne species, larger Echinodorus plants, and most carpeting plants will benefit from root tabs in addition to liquid fertilisation. Easy Green alone won’t provide everything these plants need to thrive long term. The cost adds up if you’re running multiple tanks or larger setups.
While a 500ml bottle lasts ages for a single small tank, someone running several tanks or a large system will go through bottles fairly quickly. At that point, mixing your own fertilisers or using dry salts becomes more economical. ## How It Changed Things Easy Green succeeded because it solved a real barrier to entry in planted tanks. Before it appeared, new hobbyists faced a choice between expensive European fertiliser systems or intimidating DIY chemistry.
Many people tried plants, couldn’t get the fertilisation right, watched everything melt, and went back to plastic decorations. The Amazon listing shows 4.8 out of 5 stars rating (Amazon US) with over 2000 reviews listed on the product page (Aquarium Co Op). Those numbers represent thousands of people who got their plants to grow when they previously couldn’t.
That’s significant for the hobby. It also shifted expectations around fertiliser complexity. Other manufacturers noticed the success of the simple, single bottle approach and started simplifying their own products.
The idea that effective plant fertilisation required multiple bottles and complicated schedules became less accepted. The pump dosing mechanism influenced product design across the hobby. Several other fertiliser brands now use similar dispensing systems because it removes the measurement barrier that stopped people using their products consistently.
More broadly, Easy Green represented the Aquarium Co Op philosophy of making fishkeeping accessible rather than exclusive. It’s not about having the most advanced setup or the most technical knowledge. It’s about getting results that let you enjoy the hobby without frustration. ## The Verdict Easy Green does exactly what it promises.
It’s a straightforward, effective fertiliser that will keep plants healthy in most community tank setups without creating algae problems or requiring chemistry knowledge.
If you’re running a moderate light tank with common plants and you want fertilisation to be simple and reliable, this is probably the right choice. It’s not for high tech setups pushing maximum growth rates, and it won’t give you competition level plant colours.
But for the vast majority of planted tank hobbyists, those aren’t the goals anyway. Most people want their plants to stay green, grow at a reasonable pace, and not create maintenance headaches. Easy Green delivers that consistently.
The value proposition is solid. A single bottle lasts months for most setups, the dosing is foolproof, and it works reliably across a wide range of tank conditions. For someone setting up their first planted tank, or someone who’s tired of complicated fertiliser schedules, it removes one significant source of potential problems.
I still use it in our main family tank because it’s one less thing to think about. One pump every Sunday when I do the water change, and the plants stay healthy. Sometimes the best solution is the simple one that actually works.
See where this placed in our full fertiliser ranking.
