MK-BREED Z-Silver is fortified with nitrifying bacteria and probiotics. It removes nitrite, nitrate, and other toxins from the aquarium water and breaks down organic material from leftover food and fish/shrimp waste. This product speeds up the cycling process, stabilizes algae growth, and increases dissolved oxygen in the water. Contains nitrobacter, nitrifying bacteria, Bacillus subtitis natto , Lactobacillus faecalis , photosynthetic bacteria and other beneficial bacteria and probiotics. MK-BREED Z-Silver is particularly effective in freshwater dwarf shrimp aquariums (Caridina, Neocaridina, etc.). 30 gram jar. 1 jar treats approximately 80 gallons.