Outstanding breakthrough product drastically reduced the hassles and mess of manual aquarium maintenance chores! Voracious, non-pathogenic sludge-eating bacteria quickly and safely clean Gravel and Substrate, Mechanical Filtration Systems, Lift Tubes and Hose, Ornaments, Lice and Artificial Plants, Protein Skimmers, and other aquarium accessories, !00% chemical-free, Available for freshwater in 2 oz, , 5 oz, , 64 oz, , 1 gal, , and 5 gal, SKU: RYLHC6362