# APT Complete and the All in One Fertiliser That Changed How People Dose I’ll be honest, I was sceptical about another all-in-one fertiliser when APT Complete landed on my desk three years ago. I’d been through the whole dance before – EI dosing, separate micro and macro bottles, measuring out powders with a kitchen scale like I was running some sort of chemistry lab in my kitchen. It worked, sort of, but it felt like managing a part-time job just to keep some plants green.
Then a mate who runs a shop in Manchester told me to try this new stuff from 2Hr Aquarist. “Just one pump,” he said. “Daily.
That’s it.” I looked at him like he’d suggested I could power my CO2 system with positive thinking. But I was tired of the measuring and mixing, tired of my Rotala looking anaemic despite my best efforts with separate bottles, and frankly tired of pretending that dosing fertiliser was the relaxing part of this hobby.
Three months later, I’d restructured my entire fertilising routine around APT Complete.
Not because it’s perfect – nothing in this hobby is – but because it actually delivered on that promise of simplicity without turning my plants into expensive compost. This is the story of how one bottle changed the way thousands of aquascapers think about plant nutrition, why it works, and whether it deserves the reputation it’s built. ## Quick Reference Table | **Type** | **Suitable Tank Size** | **Price Range (£)** | **Key Feature** | **Dosing** | **Our Rating** | |———-|————————|———————|—————–|————|—————–| | All-in-one liquid fertiliser | 20L-400L+ | £25-30 | Single daily pump | 1 pump per 20L | 4.2/5 | ## The Background: Why APT Complete Happened The APT system was introduced in 2019 (2Hr Aquarist Blog) by Dennis Wong and his team at 2Hr Aquarist, and it came from a place of genuine frustration with existing fertiliser protocols. Wong had spent years watching hobbyists struggle with EI dosing – not because the science was wrong, but because the execution was a nightmare for anyone with a life outside aquascaping.
EI dosing, for those who haven’t lived through it, requires separate macro and micro nutrients dosed on alternate days, with massive water changes to reset nutrient levels weekly. It works brilliantly in the right hands. It also requires dedication that borders on obsession, precise measuring, and the sort of rigid schedule that makes keeping fish feel like a second job.
The problem wasn’t just complexity. Most commercial all-in-one fertilisers at the time were formulated for low-light, low-tech setups. They’d keep Java fern alive but couldn’t support the nutrient demands of a high-light CO2 system growing demanding red plants.
You’d dose according to the bottle, watch your Ludwigia turn pale green, then end up supplementing with separate iron anyway. APT Complete was designed specifically for tanks with CO2 injection (2Hr Aquarist), which immediately set it apart. This wasn’t another compromise fertiliser trying to work for everyone.
It was built for the people running proper planted tanks with decent lighting and pressurised CO2, and it showed in the formulation. ## What Makes APT Complete Different The first thing you notice about APT Complete is what isn’t on the bottle. No complicated dosing schedule. No separate micro and macro bottles.
No measuring spoons or syringes. Just one pump per 20L daily (2Hr Aquarist), and you’re done. That simplicity masks some serious chemistry underneath.
The nutrient profile reads like someone actually thought about what plants in a CO2-injected tank need to grow properly. It contains 3.38% nitrate (Aquarium Fertiliser), which is substantial enough to support fast-growing stems without creating the sort of nitrate spike that sends algae into overdrive. Phosphate sits at 0.31% (Aquarium Fertiliser), which gets interesting when you work out the N ratio.
This isn’t following Redfield religiously – it’s calibrated for what actually happens in a planted tank where plants consume nitrogen faster than phosphorus, especially under high light with CO2 injection. The potassium content of 3.9% (Aquarium Fertiliser) is where things get serious. Most all-in-one fertilisers skimp on potassium because it’s expensive and takes up space in the bottle.
APT Complete doesn’t compromise here, and it shows in how plants respond. Proper potassium levels mean better photosynthesis, stronger growth, and colours that actually develop instead of staying disappointingly green. The trace elements tell the same story.
Iron comes in at 0.13% (Aqua Rocks Colorado), which doesn’t sound like much until you realise how quickly most iron supplements get locked up in substrate or precipitate out of the water column. The chelation here actually works – I’ve seen red plants respond to APT Complete in ways they never did to separate iron dosing. Magnesium sits at 0.29% (Aqua Rocks Colorado), which addresses one of those overlooked deficiencies that can kill a scape slowly.
Most people don’t test for magnesium. Most fertilisers don’t include enough of it. Plants need it for chlorophyll production, and when it’s missing, you get that pale, weak growth that no amount of extra iron seems to fix.
But here’s what really sets APT Complete apart – it’s the dosing philosophy. One pump daily means consistent nutrient availability without the massive swings that come with traditional dosing methods. Plants get what they need when they need it, instead of feast-or-famine cycles that stress them and create opportunities for algae.
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The 500ml bottle treats approximately 10,000L at recommended dosing (The Green Machine), which works out to genuine value when you factor in convenience. No separate bottles, no measuring, no forgetting which day you’re supposed to dose micros versus macros. ## The Honest Assessment: Where APT Complete Falls Short Nothing’s perfect, and APT Complete has limitations that matter depending on what you’re trying to achieve. The biggest one is flexibility – or the lack of it.
With traditional EI dosing, you can adjust individual nutrients based on how your specific tank responds. Your Rotala needs more iron? Dose more iron.
Your substrate is leaching phosphates? Cut back the macros. With APT Complete, you’re locked into their ratios.
If your tank needs more of one nutrient and less of another, you’re stuck either under-dosing everything or over-dosing the bits you don’t need. I learned this the hard way with a high-tech tank that was pulling nitrogen out of the water column faster than the fertiliser could replace it. The only solution was supplemental KNO3, which defeated the whole point of using an all-in-one.
The formulation assumes you’re running CO2, and it shows. I tried it in a low-tech setup once, thinking the lower nutrient demands might work. It didn’t.
The plants couldn’t utilise the available nutrients without proper CO2 levels, algae moved in to clean up the excess, and within two weeks I was back to root tabs and much lighter liquid dosing. Cost per dose works out reasonable, but the upfront price can be shocking if you’re used to mixing your own fertilisers from dry salts. A 500ml bottle costs around £25-30, which buys a lot of KNO3 and KH2PO4 if you’re willing to do the measuring.
For someone running multiple tanks, the economics start to favour traditional methods pretty quickly. There’s also the question of what happens when things go wrong. With separate macro and micro dosing, you can troubleshoot nutrient issues by adjusting individual components.
With APT Complete, your options are dose more, dose less, or switch to something else entirely. When my Cryptocoryne started showing potassium deficiency symptoms last year, I couldn’t just increase the K without also increasing everything else in the bottle. The pump dispenser, while convenient, isn’t precise enough for smaller tanks.
One pump is calibrated for 20L, which means nano tank owners are either under-dosing or trying to measure fractions of pumps. I’ve seen people attempt to dispense half pumps with predictably inconsistent results. ## Legacy and Influence: How APT Complete Changed the Market The success of APT Complete shows in the numbers. The Amazon listing shows 4.6 out of 5 stars rating (Amazon US) across thousands of reviews, but more importantly, it forced other manufacturers to rethink their all-in-one formulations.
Before APT Complete, most liquid fertilisers were either too weak for serious planted tanks or required complicated multi-bottle systems. The market was split between people doing proper EI dosing with separate chemicals and casual hobbyists using fertilisers that barely kept basic plants alive. APT Complete proved there was demand for something in between – a single bottle that could actually support demanding plants in high-tech setups.
Within two years of its launch, every major aquascaping brand had released or reformulated their all-in-one products to compete. Higher nutrient concentrations, better trace element profiles, more convenient dosing systems. The influence extends beyond just copying the formulation.
The whole approach to fertiliser marketing changed.
Instead of technical jargon about NPK ratios and chelation chemistry, companies started talking about simplicity and results. The message shifted from “here’s what’s in it” to “here’s what it does for your plants.” More significantly, APT Complete legitimised the idea that you could run a serious planted tank without becoming a chemistry expert.
It brought high-tech aquascaping within reach of people who wanted beautiful planted tanks but didn’t want to spend their evenings calculating fertiliser doses. ## The Verdict APT Complete isn’t the perfect fertiliser – there’s no such thing. But it’s the right fertiliser for a specific type of aquascaper: someone running a CO2-injected tank who wants healthy plant growth without the complexity of traditional dosing methods. If you’re the sort of person who enjoys measuring out precise amounts of KNO3 and adjusting your micro dosing based on weekly plant observations, APT Complete will frustrate you with its inflexibility.
If you’re running a low-tech tank or trying to keep costs minimal across multiple setups, it’s probably not worth the premium. But if you want to dose once daily and actually see your red plants develop proper colour, if you’re tired of algae blooms from inconsistent fertilising, or if you just want your planted tank to be the relaxing part of your day instead of another chore, APT Complete delivers on its promises. Three years after my first bottle, I’m still using it in my main display tank.
Not because I’ve never had issues with it, but because the issues I’ve had were minor compared to the problems it solved. Sometimes the best solution isn’t the most technically perfect one – it’s the one that actually works for how you live your life. See where this placed in our full fertiliser ranking.
