MicroBacter Start XLM 15x is a super concentrated live tank starter bioculture that rapidly establishes biological filtration in new marine and reef aquariums. This product is specifically formulated to speed up the cycling process, making it ideal for aquarists setting up new tanks or recovering from issues like overcrowding or bacterial damage due to cleaning or medication use. It contains non-pathogenic microbes that quickly reduce toxic ammonia and nitrite levels, preventing 'New Tank Syndrome' which can be harmful to aquatic life.