2HR Aquarist APT E is a specially developed liquid fertiliser for aquarium plants based on the Estimative Index (EI) method. This fertilisation strategy ensures an optimum supply of macro and micro nutrients, allowing plants to grow healthily and develop to their full potential. The EI approach pioneered by Tom Barr is designed to provide a unlimited / unconstrained amount of nutrients to plants based on a professionally Estimated Index of their needs. APTe provides a calibrated version for richer coloration and algae control.2HR Aquarist APT E/Estimative Index+ complete nutrient supply for heavily planted aquariums+ contains all essential macro and micronutrients+ promotes healthy, rapid plant growth+ supports CO2 fertilisation for maximum efficiency+ ideal for aquascaping and brightly lit aquariums+ ideally for -Dutch Style tanksDosage 2HR Aquarist APT E/Estimative IndexDosage: 2 ml per 100 litres of aquarium water per day (with normal planting). The dosage can be adjusted individual