2Hr Aquarist APT Estimative Index (APT EI) – High-Performance Aquarium Plant Fertilizer
Expert-Grade EI Dosing Made Easy
The 2Hr Aquarist APT Estimative Index (APT EI) delivers the powerful, proven EI nutrient dosing method in a ready-to-use liquid concentrate. Based on the renowned approach pioneered by Tom Barr, APT EI provides advanced aquascapers with the ultimate control over plant nutrition—without the guesswork.
Designed for heavily planted tanks and experienced aquarists, APT EI is ideal for high-growth setups where maximum nutrient availability is critical for optimal plant performance.
Why Choose APT Estimative Index?
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Pre-mixed EI formula based on Tom Barr's proven method
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Delivers a full spectrum of macronutrients and micronutrients in precise EI ratios
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Supports robust plant growth, vibrant coloration, and algae resistance
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Includes a calibrated pump for easy, accurate dosing
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Ideal for Dutch-style tanks and advanced aquascaping setups
Dosage Instructions
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Dose 5ml per 100L, three times per week
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Or dose 2ml per 100L daily
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Comes in a 500ml bottle, lasting approximately 3 months for a 190L tank
Which APT Fertilizer Is Right for You?
| Product | Best For | Description |
|---|---|---|
| APT Zero (APT 1) | More fish, fewer plants | No nitrates/phosphates; maximum algae control |
| APT Complete (APT 3) | More plants, fewer fish | Full macro, micro & trace elements for balanced growth |
| APT EI (APT 5) | Heavily planted tanks / EI users | Concentrated EI formula for expert aquascapers |
Real Results, Backed by the 2Hr Way
APT fertilizers are developed by aquascapers, for aquascapers. Using the 2Hr Way, plants grow with stronger form, richer colouration, and greater resilience. Even in demanding tanks, APT EI ensures your plants receive a complete and consistent nutrient supply.
