Professional 15x strength powerful live tank starter nitrifying bioculture, with much fewer temperature and shelf life restrictions than competing products, for rapidly cycling new marine fish and reef aquaria and brackish aquariums, and for recovering from overcrowding or disasters where the bacteria bed has been damaged or when adding new fish. It is also quite useful after re-arranging decorations or performing major maintenance, such as cleaning substrates or biological media to "recharge" the nitrifying bacteria population.