Fluval Shrimp Stratum, 4.4-Pound Substrate for freshwater aquariums only Does not discolor water, and helps control organic discoloration usually present when natural driftwood is used Provides newborn shrimp with the ideal refuge, allowing them to escape predation until they are grown Similar to the Fluval Plant Stratum, however its smaller composition makes it ideal for shrimp to climb on Recommended depth is 1.25 inches to 1.5 inches