The 2Hr Aquarist APT 3 – Complete Aquarium Fertilizer

2Hr Aquarist APT3

APT 3 is the balanced APT liquid fertiliser positioned by the manufacturer as the standard choice for many planted aquariums.

Best for

Planted aquariums; tanks with more plants than fish; demanding planted layouts; CO2 aquariums

How to use

Dose consistently; manufacturer advises its dosage calculator for tanks without CO2 or mostly slow-growing/shade plants.

Technical information

N 0.75%; P2O5 0.69%; K2O 4.52%; Mg 1.10%; Fe 0.12% chelated

Composition: Potassium sulphate, potassium phosphate, potassium chloride, magnesium nitrate, magnesium sulphate, DTPA iron, EDTA iron, EDDHA iron

Important

Introduce gradually when switching fertilisers if the aquarium is established and sensitive to nutrient changes.

Related APT products

APT 1, APT e, APT Pure, APT Fix, APT Jazz

Manufacturer: The 2Hr Aquarist. Technical information verified against the official manufacturer page on 2026-09-28.