ADA Bacter Ball 18pcs - Beneficial Bacteria Balls for Aquarium Water Treatment | Improves Water Quality for Fish Tanks, Shrimp Tanks & Aquatic Plants

Bacter Ball is a sphere shape substrate additive made from Bacter 100. You can place it on the substrate and inside the biological filtration system. It helps keeping healthy condition of fish and shrimp nibbling on Bacter Ball.