Polyp lab Medic contains a reef-safe oxidizing agent and is particularly effective against: Marine Ich – Crytpocaryon irritans Freshwater Ich – Ichthyophthirius multifiliis Marine Velvet – Amyloodinium ocellatum Features Completely reef-safe Buffered to maintain physiological pH Does not harm invertebrates Does not harm nitrifying bacteria Size: 30mL – (Treats 2000lt of aquarium volume)