Aquarium Co-Op's Easy Green is a comprehensive all-in-one liquid fertilizer designed for freshwater planted aquariums. It contains nitrogen, phosphorus, potassium, and a full spectrum of micronutrients including iron, magnesium, and manganese. For most planted tank hobbyists, it's the only fertilizer they need, and the dosing is intentionally simple: one pump per 10 gallons once a week. If your plants are growing well and your water looks clear, that's the routine you stick to.

This guide covers what's in Easy Green, how to dose it correctly, how to troubleshoot dosing problems, how it compares to other fertilizers, and how to use it alongside a CO2 system.

What's in Easy Green and Why It Works

Easy Green uses a chelated formula, meaning the nutrients are bound to organic molecules that make them more bioavailable to plants and less likely to react with carbonates in the water before the plants can absorb them. Unchelated iron, for example, oxidizes rapidly in aquarium water and becomes useless to plants within hours of dosing. Chelated iron stays available for days.

The nutrient profile in Easy Green is balanced for typical planted tank conditions. It provides:

  • Nitrogen (primarily as nitrate): the building block of chlorophyll and amino acids
  • Phosphorus: needed for root development and energy transfer
  • Potassium: supports overall plant health and stress resistance
  • Iron: necessary for chlorophyll synthesis; deficiency shows as yellowing new leaves
  • Magnesium: central atom of the chlorophyll molecule
  • Manganese, boron, zinc, copper, molybdenum: micronutrients needed in small quantities but often depleted in established tanks

The formula was developed and refined through extensive testing by Aquarium Co-Op in their retail store tanks, which run under a wide variety of conditions. It works across different plant types, pH levels from 6.0 to 8.0, and both soft and hard water.

How to Dose Easy Green Correctly

The standard dosing recommendation is 1 pump per 10 gallons, once per week. Each pump delivers approximately 1 ml of fertilizer.

Low-Tech Tanks Without CO2

In a low-tech tank with low to medium light and no CO2 injection, plant growth is slow and nutrient uptake is limited. Starting at the standard dose (1 pump per 10 gallons weekly) is correct. If after 4 to 6 weeks your plants are growing slowly but there's no algae outbreak, the dose is appropriate.

You can verify adequate nutrition by testing nitrate levels 24 hours after dosing. Ideally, you want nitrate at 10 to 25 ppm after the weekly dose in a healthy low-tech tank. If your nitrate is consistently below 5 ppm between doses, increase to 2 pumps per 10 gallons weekly.

High-Tech Tanks With CO2 Injection

CO2-injected tanks with high light grow plants rapidly, which means faster nutrient consumption. Many hobbyists dose Easy Green 2 to 3 times per week in these setups, starting with the standard dose and increasing based on plant response and algae signals.

Signs your plants need more fertilizer: - Yellowing on older leaves (nitrogen deficiency) - Yellow or white new growth at the tips (iron or potassium deficiency) - Holes in older leaves (potassium deficiency) - Slow growth despite adequate light and CO2

Signs you're overdosing: - Green water algae blooms - Hair algae or thread algae taking off - Brown diatom growth increasing significantly

How to Add Easy Green

Add Easy Green to the tank directly after a water change, before refilling completely. This way the fresh water dilutes the fertilizer immediately and distributes it throughout the tank. Alternatively, add it directly to the tank water any time during the week. There's no benefit to dosing at a specific time of day.

Shake the bottle briefly before each use to ensure the formula is fully mixed.

Easy Green vs. Other Fertilizers

Several other liquid fertilizers compete in the same space. Here's how Easy Green compares to the most common alternatives.

Seachem Flourish

Flourish is primarily a micronutrient supplement with minimal macronutrients. You'd need to add Seachem Nitrogen, Seachem Phosphorus, and Seachem Potassium separately to get a complete fertilizer profile. This gives you more precise control but requires buying and managing three to four bottles instead of one. For hobbyists who want to adjust individual parameters, Flourish works well. For those who want simplicity, Easy Green is more straightforward.

Cost comparison: A 500ml bottle of Easy Green costs about $16. Getting comparable nutrient coverage from Seachem's line requires 3 to 4 products totaling $30 to $50.

Thrive by NilocG

Thrive is the closest competitor to Easy Green in both formula and philosophy. It's all-in-one, concentrated, and comes in standard and plus versions. Price is similar to Easy Green. The main difference is formula ratios: Thrive has slightly higher potassium and lower phosphorus. Most plants don't respond noticeably differently to either product, and both have large, enthusiastic user bases.

API Leaf Zone

API Leaf Zone is a budget fertilizer that contains only iron and potassium. It's not adequate as a complete fertilizer for planted tanks. Plants will develop nitrogen and phosphorus deficiencies over time without additional dosing. It's useful as a supplement but not a standalone solution.

For a broader look at planted tank equipment including fertilizers, lighting, and substrate, see the Best Aquarium Equipment guide.

Using Easy Green With CO2 and Substrate

Easy Green works in any substrate but performs best when paired with a nutrient-rich base. In tanks with inert substrates like plain gravel or pool sand, Easy Green handles the water column nutrients but root-feeding plants like crypts and swords also benefit from root tabs in the substrate.

In tanks with ADA Amazonia or similar buffered aqua soil, the substrate provides nutrients for the first 3 to 6 months. You can reduce Easy Green dosing during this period and increase it as the substrate becomes depleted over time.

When using CO2 injection, plant growth rate and therefore nutrient consumption increases significantly. Monitor plants weekly and adjust Easy Green dosing upward if you see nutrient deficiency signs. In a heavily planted high-CO2 tank, dosing 3 times per week with 2 to 3 pumps per 10 gallons is not unusual.

For more equipment recommendations for high-tech planted setups, the Top Aquarium Equipment roundup covers lighting, CO2 systems, and filtration alongside fertilizers.

Common Easy Green Mistakes

A few mistakes come up consistently with Easy Green users.

Overdosing to fix problems faster. If your plants show deficiency signs, increasing fertilizer helps, but not immediately. Plants show deficiency on leaves that already grew; new growth after corrected dosing will be healthy. Give it 2 to 3 weeks before assuming the dose increase didn't work.

Dosing without sufficient light. Easy Green provides nutrients, but plants can't use nutrients without light for photosynthesis. If your light is inadequate, increased fertilizer won't make plants grow faster. It will feed algae instead.

Not shaking the bottle. The formula can separate slightly in storage. Skipping this step means inconsistent doses.

Expecting results in days. Aquatic plants are slower to respond than terrestrial plants. Give any dosing change 3 to 4 weeks to show results in new growth before changing the approach.

FAQ

Can Easy Green be used in shrimp tanks? Yes. Easy Green is safe for freshwater invertebrates including cherry shrimp, amano shrimp, and dwarf shrimp at standard doses. Some shrimp hobbyists reduce to half dose as extra caution, though there's no documented toxicity at standard levels.

Does Easy Green raise nitrates? Yes, it contains nitrogen in the form of nitrate. This is intentional and necessary for plant growth. In a planted tank, healthy plants consume that nitrate. In a non-planted or lightly planted tank, Easy Green will raise nitrate levels, which you'd need to manage through water changes. Don't add it to tanks without live plants.

How long does a bottle of Easy Green last? A 250ml bottle (around $10) contains roughly 250 doses of 1 ml each. For a 30-gallon tank dosed at 3 pumps weekly, that's about 83 weeks or nearly 2 years. The 500ml bottle at $16 offers significantly better value per dose.

My plants are still yellowing after dosing Easy Green for a month. What's wrong? First rule out light deficiency by confirming your light delivers adequate PAR for your plant species. Then check if the yellowing is on old leaves (common during plant transitions) or new growth. Yellowing on new growth specifically points to a micronutrient deficiency, often iron. Try increasing Easy Green to twice weekly or supplementing with Seachem Iron directly.

The Bottom Line

Easy Green is one of the most practical fertilizers for planted aquariums because it removes the guesswork from a complicated subject. One product covers macro and micro nutrition, the dosing is straightforward, and it works across a wide range of tank conditions. Start at the standard dose of 1 pump per 10 gallons weekly, watch your plants for growth or deficiency signals over the following month, and adjust from there. That approach works for the vast majority of planted tank setups.