The most expensive mistake in aquarium fertilizing is not buying the wrong bottle — it is dosing the new bottle like the old one. Swap Easy Green for APT Complete, keep pumping once a week, and your plants starve for three weeks before the yellowing tips tell you. The APT Complete vs Easy Green debate looks like brand loyalty, but it is a math problem: two genuine all-in-one fertilizers with different NPK ratios, different dosing rhythms, and opposite ideas about how much your tank should get.
Get the math right and either bottle grows beautiful plants. Get it wrong and you pay twice — once for the bottle, once in algae or stunted growth. Here are the numbers, side by side.
APT Complete vs Easy Green: the numbers on paper
Both earn their place in our roundup of the 6 Best Liquid Fertilizers for Aquarium Plants — for different reasons. Strip away the branding and each bottle is a delivery system for three numbers. Per aquariumscience.org's side-by-side breakdown of commercial fertilizer NPK ratios, APT Complete runs 1.8-0.7-3.8 while Easy Green runs 2.7-0.5-9 — and that gap shapes everything else.
| APT Complete (2hr Aquarist) | Easy Green (Aquarium Co-Op) | |
|---|---|---|
| NPK ratio | 1.8-0.7-3.8 | 2.7-0.5-9 |
| Label dose | 5 mL per 100 L | 1 mL per 10 gallons |
| Schedule | 4x per week (or 3 mL/100 L daily) | 1–3x per week, by light level |
| Macros per label dose | 1.8 ppm nitrate, 0.7 ppm phosphate, 3.8 ppm potassium | 0.7 ppm nitrogen, ~0.26 ppm phosphate, 2.3 ppm potassium |
| Shrimp-safe | Yes, at label dose | Yes, at label dose |
| Cost per dose (20 gal) | ~$0.40 (200 mL bottle) | ~$0.06 (16 oz bottle) |
Two rows deserve attention. Potassium: Easy Green delivers more than twice the K (9 vs 3.8), and K is the macro plants burn through fastest — aquariumscience's analysis of DIY fertilizer formulas puts the rough optimum near 2.5-0.5-7.5, close to Easy Green. APT Complete runs leaner on purpose, part of its nitrate-limiting approach to color and algae control. And magnesium: APT includes it (0.4 ppm per dose) while Easy Green's label doesn't — a real edge if your tap water is soft.
Lean precision vs generous abundance
Dennis Wong built APT Complete on a middle path between Tom Barr's Estimative Index (dose everything in excess, reset with big weekly water changes) and ADA's restrained Nature-Style approach. The 2hr Aquarist system keeps the water column lean — nitrate-limiting, in their words — while roots pull from a rich substrate. Less nitrate in the water means richer reds and pigment in demanding plants, and less fuel for algae.
Aquarium Co-Op bets the other way: one pump per 10 gallons, one to three times a week by light level, with a weekly water change resetting the rest. Dose confidently rather than precisely. The practical difference is forgiveness — skip a day of APT Complete and you've missed a quarter of the week's nutrition; skip a day of Easy Green and the tank barely notices.
What a dose actually costs
Sticker price lies; per-dose cost tells the truth. For a 20-gallon tank: Easy Green, the 16 oz bottle runs about $15 and a dose is 2 mL — roughly 236 doses at $0.06 each, or $0.06–0.13 per week. APT Complete, the 200 mL bottle runs $20–25 and a dose is about 3.8 mL — roughly 52 doses at $0.40 each, or near $1.60 a week. The 500 mL bottle (around $25–30) roughly halves APT's per-dose cost, but Easy Green still wins by a wide margin.
The gap widens with tank size — on a 75-gallon tank, lean bottled dosing gets expensive fast, which is when many hobbyists read our dry vs liquid fertilizer comparison. Whichever bottle you choose, fold it into a weekly aquarium plant fertilizer schedule you will actually follow; the cheapest fertilizer is the one that gets dosed.
One of the two head-to-head products; per-dose math section names it directly: APT 3 Complete.
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Both are explicitly marketed safe for fish, shrimp, and snails at label doses and widely used in shrimp tanks. Treat the label dose as the safety line, especially in a breeding colony, where shrimplets are less forgiving of chemistry swings than adults. For what "shrimp safe" really means on a fertilizer label, see our shrimp-safe aquarium fertilizers guide. Neither product is the risk here; overdosing either of them is.
Where this duel fits in the wider fertilizer field
Two boundaries before you buy. First, if you haven't confirmed your tank needs added fertilizer at all, start with whether aquarium plants really need fertilizer — fish waste covers more of the bill than beginners expect. Second, know what this comparison is not: choosing between a micros-only supplement and an all-in-one is a different buying question, answered in our Seachem Flourish vs Easy Green comparison. Here both bottles are complete — the only question is which complete formula fits your tank.
The honest verdict, by tank
- Low-tech tank, no CO2: Easy Green — pump math, a forgiving weekly rhythm, and the lowest per-dose cost.
- High-tech CO2 aquascape chasing color: APT Complete — the lean, nitrate-limiting approach was built for exactly this.
- Big tank (55 gal+): Easy Green on running cost, unless you step up to dry salts.
- Shrimp breeding colony: Either, at strict label doses — Easy Green's simpler schedule means fewer chances to overdose.
- Heavy root feeders (swords, crypts): Either bottle plus root tabs — water-column ferts alone leave them hungry.
Frequently Asked Questions
Can I use APT Complete and Easy Green together?
No reason to. Both are complete fertilizers, so combining them just doubles your macros — usually straight into an algae bloom. Pick one, run it on its own schedule for a month, and adjust from plant response and test readings.
Which is better for a low-tech tank without CO2?
Easy Green, in most cases. Slow-growing low-tech plants can't use APT Complete's four-times-a-week precision schedule, and the simpler weekly pump rhythm matches their pace. Start at one dose per week for low light and increase only if deficiency signs appear.
Is APT Complete really safe for shrimp?
Yes, at label doses — it's marketed for shrimp and invertebrate tanks and widely used in them. Breeding colonies are less forgiving of chemistry swings, so measure carefully and never exceed the label. Our shrimp-safe fertilizers guide covers the details.
Why does Easy Green contain so much more potassium?
Potassium is the macro plants consume fastest, and Easy Green's generous philosophy shows it: independent analysis puts the rough optimum near 2.5-0.5-7.5, and Easy Green's 2.7-0.5-9 sits close. APT Complete runs leaner deliberately, part of its nitrate-limiting approach to color and algae control.
Do I still need root tabs with either fertilizer?
For heavy root feeders like Amazon swords, crypts, and lotus — yes. Liquids feed the water column; root tabs feed the substrate where these plants eat. Aquarium Co-Op's own system pairs Easy Green with root tabs, and the same logic applies to APT Complete.
The one-sentence answer
Buy Easy Green if you want the simplest, cheapest complete routine that just works; buy APT Complete if you run CO2, chase red plants, and enjoy the precision of a lean dosing system. Either way, the bottle is only half the purchase — the schedule you actually follow is the other half.