Here is the part the labels hide: one of these two bottles will carry your tank roughly twice as far per dose as the other — and both manufacturers technically tell you that, if you read past the marketing. Thrive vs Easy Green is the most-asked fertilizer question in the planted tank hobby, and the honest answer is less about which formula is "better" and more about which dosing logic matches your tank. Let us compare the labels, the math, the money, and the quirks hobbyists actually report, so you can buy once and stop second-guessing.
Label vs label: the guaranteed analyses side by side
Put the two bottles next to each other and the first thing you notice is how similar the headline numbers look. Both are all-in-one fertilizers, meaning they carry the three macronutrients (nitrogen, phosphorus, potassium) plus magnesium and a full set of traces in a single bottle. Neither requires a second or third bottle to work. The differences live in the fine print.
Thrive's guaranteed analysis reads 2.56% total nitrogen (all of it nitrate nitrogen), 1.58% phosphate, and 9.74% potash. Its micronutrient list is generous: 0.42% chelated iron using both DTPA and EDTA chelates — a meaningful detail, because DTPA keeps iron available at higher pH while EDTA covers lower pH — plus 0.32% magnesium, 0.54% sulfur, 0.168% manganese, 0.008% boron, 0.0038% zinc, 0.0006% molybdenum, and 0.0002% copper.
Easy Green reads 2.66% nitrogen, 0.46% phosphate, and 9.21% potash, with 0.7% magnesium, 0.13% iron, 0.036% manganese, 0.015% boron, 0.0072% zinc, 0.00098% molybdenum, and — deliberately — zero copper.
Three things worth noting in that comparison. First, Thrive is meaningfully richer in micros: roughly three times the iron and nearly five times the manganese. If your red stems have been pale and your light is already strong, that extra iron headroom is the most tangible advantage either bottle has. Second, Easy Green's phosphate line is noticeably leaner (0.46% vs 1.58%), which matters in tanks with heavy fish loads where the animals already supply plenty of phosphorus. Third, the copper difference is real but small: 0.0002% is a trace a test kit will never see, and NilocG states Thrive is shrimp-safe at the recommended dose — more on that below.
| Nutrient | NilocG Thrive | Aquarium Co-Op Easy Green |
|---|---|---|
| Total nitrogen (N) | 2.56% | 2.66% |
| Phosphate (P₂O₅) | 1.58% | 0.46% |
| Potash (K₂O) | 9.74% | 9.21% |
| Magnesium (Mg) | 0.32% | 0.70% |
| Iron (Fe) | 0.42% (DTPA + EDTA) | 0.13% |
| Manganese (Mn) | 0.168% | 0.036% |
| Copper (Cu) | 0.0002% | 0.00% |
| Standard dose | 2 mL per 10 gal | 1 mL per 10 gal |
Dosing math: what one pump actually adds
This is where the comparison gets concrete. Both products dose with a pump, both scale by 10 gallons, and both adjust frequency — not dose size — to match your light level. Thrive's pump delivers 2 mL per 10 gallons, Easy Green's delivers 1 mL. Both makers recommend once weekly for low-light tanks and two to three times weekly for medium-to-high-light tanks.
Running the label percentages through the per-dose math (a routine calculation hobbyists on the ScapeCrunch and Barr Report forums have published for both products):
| Per pump | Thrive (2 mL) | Easy Green (1 mL) |
|---|---|---|
| Nitrate (NO₃) | ~7 ppm | ~3 ppm |
| Phosphate (PO₄) | ~1.0 ppm | ~0.16 ppm |
| Potassium (K) | ~4 ppm | ~2.0 ppm |
| Iron (Fe) | ~0.25 ppm | ~0.034 ppm |
| Magnesium (Mg) | ~0.17 ppm | ~0.18 ppm |
Two practical consequences follow. First, Thrive's bigger dose adds roughly twice the macros per pump — which is exactly why one bottle of Easy Green (500 mL treating about 5,000 gallons of dosing at 1 mL per 10 gallons) mathematically outlasts a 500 mL bottle of Thrive (~2,500 gallons at 2 mL per 10 gallons). Second, Thrive's nitrate contribution is the one that trips up beginners: ~7 ppm per dose, three times a week, stacks up fast in a stocked tank that already runs 20+ ppm nitrate from fish waste. If your tap water already carries nitrate, start Thrive at once weekly and test before adding frequency.
The honest cost-per-dose comparison
Prices change too often to print here, so run your own numbers with this formula — it is the only fertilizer math that matters:
(bottle price ÷ bottle mL) × mL per 10-gallon dose = cost per dose.
Thrive doses 2 mL per 10 gallons; Easy Green doses 1 mL. So per dose, you are buying twice as much Thrive. The question is whether the bottle price gap makes up for it. Historically it does — Thrive's 500 mL bottle has consistently sold at a meaningfully lower price point than Easy Green's equivalent, which is why hobbyist forums routinely call Thrive the budget winner. But do not take forum lore as gospel; plug in the actual shelf prices you see today, because both brands run promotions and bottle sizes differ.
Two cautions on the "cost per bottle" framing. First, Easy Green's 500 mL bottle treats about twice the cumulative gallons as Thrive's 500 mL — so if a big bottle of Easy Green tempts you because it "lasts longer," divide by the 1 mL vs 2 mL dose difference before celebrating. Second, the cheapest long-term option is not either bottle: it is dry fertilizers (potassium nitrate, monopotassium phosphate, CSM+B traces), which the same manufacturers both effectively sell in kit form. But dry dosing demands a scale, storage, and a calculator — the bottle premium is the price of convenience, and for most beginners it is worth it.
Which one fits your tank type
This is the section that actually settles the debate for most people, because the "right" bottle depends on the tank, not the hobbyist consensus.
Low-tech tanks (low light, no CO₂, moderate stocking): This is the most common setup, and either bottle works — which is why the debate never dies. The tiebreaker: ThriveC exists specifically for this scenario, with nitrate and phosphate dialed down for tanks where fish waste already supplies plenty. If your nitrates sit above 20 ppm before you ever dose, ThriveC is the smartest bottle in the Thrive family. If you prefer one bottle and zero decisions, Easy Green at 1–2 pumps weekly is the simplest path.
High-tech tanks (medium-high light, CO₂ injection, fast stems): Plant demand is relentless here, and you will dose 2–3× weekly regardless. Thrive+ is the purpose-built option — its nitrogen includes urea-style sources plants take up quickly, and it is formulated around the Estimative Index method that high-tech growers already follow. Easy Green works fine here too at triple dosing, but you will burn through a 500 mL bottle noticeably faster than a Thrive user at the same tank size, because the 1 mL-per-10-gallon dose adds roughly half the nutrients per pump.
Nano tanks (2.5–10 gallons): Easy Green's 1 mL-per-10-gallon dose is friendlier to micro-dosing — half a pump for a 5 gallon tank is a small, repeatable action, whereas Thrive's 2 mL pump is calibrated for larger volumes and the brand's own advice is to dose per 5 gallons (1 mL) with a measuring cap or syringe. If you run a betta cube, Easy Green is the less fiddly choice.
High-bioload community tanks (lots of fish, few plants): Skip both standard formulas and reconsider: heavily stocked tanks often need potassium and micros only, since fish waste covers nitrogen and phosphorus. Either line's lean option — Easy Green at reduced frequency, or ThriveC — beats the full-strength versions here.
Shrimp, snails, and the copper question
Easy Green's zero-copper formula is its single biggest marketing advantage, and it is genuine: the label reads 0.00% copper, and it is the bottle shrimp keepers reach for without a second thought. Thrive contains 0.0002% copper — a trace amount NilocG explicitly states is safe for shrimp and snails at the recommended dose, and thousands of planted shrimp tanks run Thrive without incident. Copper is a micronutrient, not a poison at these concentrations; it only becomes a concern at levels far beyond what any all-in-one delivers.
The honest hierarchy: if shrimp are the point of the tank, ThriveS is the purpose-built choice — no added copper at all, with nitrogen, phosphate, and potash rebalanced lower (0.43-0.14-5.5) to suit the steadier water parameters shrimp breeding wants. If shrimp are present but plants are the priority, either standard bottle dosed as directed is fine. What actually kills shrimp during fertilizing is not copper — it is hobbyists panic-dosing five times the label rate, or swinging parameters with massive dose changes. Dose the label, change one thing at a time, and the copper debate disappears.
Quirks real hobbyists report
After years of forum threads on both products, the same complaints repeat — and they are worth knowing before you buy.
Thrive users occasionally report salt crystallization at the bottom of the bottle and nitrate creep in stocked tanks when the label's upper frequency (3× weekly) is applied to low-tech setups. The crystallization is cosmetic — shake and dose normally. The nitrate creep is real: if your tank already runs 20+ ppm nitrate, start at 1× weekly and test, or pick ThriveC. Thrive also switched from a lotion-style pump to a measuring-cap bottle design, which some users prefer for small tanks and others miss the pump for — a matter of taste, not function.
Easy Green users report occasional pump-quality grumbles and, in a few threads, clumping or salt residue at the bottle's bottom — the same cosmetic issue, resolved by shaking. The more substantive critique is value: it is the pricier bottle per equivalent dose, and in high-tech tanks you will dose it 3× weekly and watch the bottle drain faster than the label suggests. Aquarium Co-Op's own forum advice is refreshingly honest about this: start at one pump per 10 gallons, watch the plants for 2–4 weeks, and only increase if growth demands it.
Both products share one quirk worth stating plainly: neither will cause algae by itself. Algae follows light and imbalance — excess light with stagnant nutrients, decaying leaves left in the tank, inconsistent CO₂ — far more reliably than it follows a fertilizer label. If algae appears after you start dosing, cut your light period first and look at maintenance second; the fertilizer is third on the suspect list.
The verdict: buy this one
If you want one clear recommendation: buy Thrive if cost per dose and formula choice matter to you; buy Easy Green if you want the simplest possible routine and a zero-copper label. In a typical medium-light community tank, either bottle grows plants well — the differences only become decisive at the edges (high-tech demand, shrimp-first tanks, nano micro-dosing).
Thrive's verified 500 mL pump bottle (the one I would link you to) is the budget-conscious pick: complete macros and micros, generous iron at 0.42% with dual DTPA/EDTA chelation, and a family of variants — Thrive+ for CO₂-injected tanks, ThriveC for low-tech setups, ThriveS for shrimp tanks — so you can graduate within the same brand as your tanks evolve.
As an Amazon Associate I earn from qualifying purchases. The link below is an affiliate link; it costs you nothing extra and supports this site's testing.
→ NilocG Thrive All-in-One Aquarium Plant Fertilizer, 500 mL pump bottle (Amazon) ★4.6 — verified live and in stock at the time of writing, 4.6★ across hundreds of ratings, Prime-eligible.
For Easy Green, buy from the source: Aquarium Co-Op sells it direct (its Amazon listing was out of stock when I checked), and the maker's page has the current dosing chart and the full Easy line (Easy Iron, Easy Potassium, Easy Root Tabs) if you want to expand later.
→ Aquarium Co-Op Easy Green All-in-One Fertilizer (manufacturer page)
One last honest note: the best fertilizer is the one you dose consistently. A "perfect" bottle dosed sporadically loses to a mediocre bottle dosed every Sunday without fail. Pick the one whose routine you will actually keep, write the dose day on your tank lid with a marker, and let the plants do the talking.
FAQs
Does Easy Green have copper?
No. Easy Green's guaranteed analysis lists copper at 0.00% — that is the deliberate design choice, and it is why the bottle is the default recommendation for shrimp and snail tanks.
Is Thrive safe for shrimp if it contains copper?
Yes, at the recommended dose. Thrive lists copper at 0.0002%, a trace level far below what harms invertebrates, and NilocG states the standard formula is shrimp- and snail-safe. If shrimp breeding is your tank's priority, ThriveS — the no-added-copper variant — is the purpose-built option.
Can I use Thrive and Easy Green together?
You can, but there is no reason to. Both are complete all-in-one fertilizers covering the same nutrient spectrum; mixing them just doubles your variables without adding anything either bottle lacks. Pick one, dose it consistently for a month, and only switch — at a water change — if the results disappoint.
Will Thrive raise my nitrates too much?
It can in already-stocked tanks: one pump adds roughly 7 ppm nitrate to 10 gallons, and the upper label frequency (3× weekly) stacks that fast. If your tank tests above 20 ppm nitrate before dosing, start Thrive once weekly and retest after two weeks, or choose ThriveC, which is formulated with less nitrate and phosphate for low-tech, high-bioload tanks.
Which is better for a low-tech tank with no CO₂?
Either works, and this is where the choice is genuinely about preference. Easy Green is the simpler routine (1 mL per 10 gallons, 1–2× weekly). ThriveC is the more precisely tuned formula for low-tech tanks with moderate fish stocking. Avoid full-strength Thrive at 3× weekly in a low-tech tank — that is the most common way beginners manufacture their own nitrate problem.
How long does a 500 mL bottle last?
At the standard dose for a 20 gallon tank dosed once weekly: Thrive's 500 mL bottle (2 mL per 10 gallons = 4 mL per dose) lasts about 125 weeks of single dosing; Easy Green's (1 mL per 10 gallons = 2 mL per dose) lasts about 250 weeks. Real-world usage is shorter because most tanks settle at 2× weekly — but even then, you are measuring bottle life in months to years, not weeks.
Further reading from the manufacturers: NilocG's Thrive guaranteed analysis and dosing and Aquarium Co-Op's guide to choosing their fertilizer line.