"APT Zero contains the full potency of APT Complete, but without nitrates and phosphates. Specially formulated for the less demanding Non CO2 tank, with slow growing plants only (Anubias, Cryptocoryne, Bucephalandra, Microsorum etc.) 3X savings - Great Value! Concentrated so lasts 3x as long. Dosage: Dose 5ml per 100L four times a week or 3ml per 100L daily. Shrimp Friendly Even for the simplest tank, good plant health helps prevent algae and keep fish happy. APT ensures your plants get 100% of what they need. Healthy plants, happy fish, algae-free."