Dose 5ml per 100L four times a week or 3ml per 100L daily. APT Zero allows you to enjoy all the benefits of the ADA approach- unparalleled algae control and the ability to unlock the richest reds in popular plants through nitrate limitation. It should be paired with the use of aquasoil and/or a higher fishload environment. Lean but powerful. APT Zero contains the full potency of APT Complete, but without nitrates and phosphates. It is specially designed for tanks with significant fish load and for hobbyists looking to replicate the renowned ADA Dosing System. Its leaner dosing approach provides maximum algae control. Sparsely Planted Tank Tanks without Co2 Injection Tanks with high fish load The key here is the concentrate of this formula. Just 5ML per 100 liters adds the following nutrients: 0.5 PPM Magnesium 0.05 PPM Iron 3.88 PPM Potassium And additional amount of Boron Copper Manganese Molybdenum & Zinc