Fluval Shrimp Stratum is the ideal substrate for shrimp and planted aquariums featuring a light non-compacting porous structure. Its ideal properties as an aquarium substrate are highly beneficial to nitrifying bacteria which rapidly colonize the vast porous surface, providing optimal water quality for shrimp. Fluval Shrimp Stratum will provide new-born shrimp with the ideal refuge, allowing them to escape predation until they are large enough to emerge. Plants flourish as their roots easily spread and take advantage of available nutrients. The inherent properties of Fluval Shrimp Stratum will help support a neutral to slightly acidic pH, ideal for most shrimp and plant species. This highly attractive substrate does not discolor water, and helps control organic discoloration usually present when natural driftwood is used. For aquariums less than 18 inches, use one 4.4-pound bag of Stratum; 18-inch aquariums require one 8.8-pound bag of Stratum; 24-inch aquariums require two 8.8-pound bags and 35-inch aquariums require two 8.8-pound bags.