2Hr APTe EI

2Hr Aquarist APT e / Estimative Index

APT e by 2Hr Aquarist is a high-performance fertiliser based on the Estimative Index (EI) method, designed for advanced hobbyists and high-demand planted aquariums. It provides a powerful dose of essential macronutrients—nitrate, phosphate, and potassium—along with key micronutrients to fuel rapid and robust plant growth under intense lighting and CO₂ supplementation.

APT e is ideal for Dutch-style and competitive aquascapes where precise nutrient control and vigorous growth are critical. It allows aquarists to achieve lush, explosive growth while following a structured nutrient reset approach, typically paired with large weekly water changes.

Features

• Powerful, high-nutrient formulation for demanding planted aquariums
• Based on the Estimative Index method
• Ideal for high light, high CO₂, and densely planted tanks
• Provides nitrate, phosphate, potassium, iron, magnesium, and trace elements
• Best used with regular 50% weekly water changes

Application

• Daily dose: 5 ml per 100 litres
• 3–4 times per week, followed by a 50% water change at the end of each week

Recommended For

• Advanced aquarists using the EI approach
• Heavily planted aquascapes with high CO₂ and light
• Growth-focused, competition-grade planted tanks

Notes

• Not recommended for tanks with low plant load or limited maintenance
• Shake well before use
• Store in a cool, dry place away from sunlight
• Keep out of reach of children and pets

Compare with Other APT Fertilisers

• APT 1/Zero: For tanks with more fish than plants; no nitrate or phosphate
• APT 3/Complete: Balanced all-in-one fertiliser for most planted tanks