APT Estimative Index (E.I.)

APT Estimative Index by 2Hr Aquarist is the go-to liquid fertiliser for high-energy, plant-heavy aquariums. Based on the Estimative Index (EI) dosing method, it delivers a full spectrum of macronutrients and micronutrients to support explosive plant growth without the guesswork.

Whether you're running a competitive aquascape or farming aquarium plants for resale, this formula provides everything your plants need—no mixing dry salts, no measuring ratios. Just dose and grow.

Why Aquatic Plant Growers Love It:

- Formulated for aggressive growth and propagation
- Great for plant farming and trimming-heavy layouts
- Supports rapid recovery and vibrant leaf development
- Ideal for CO₂-injected, high-light aquariums
- Based on the proven EI approach with a complete nutrient profile
- Encourages dense, algae-free plant mass with regular water changes

Dosage:
Dose daily or as directed. Perform 50% weekly water changes to reset nutrient levels and prevent buildup.

Best For:

- Aquarists farming or propagating plants
- High-tech setups with CO₂ and strong lighting
- Experienced hobbyists using the EI method or looking to scale plant growth