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FB1 SubstrateStart is a highly active mixture of selected bed bacteria. All you need to do is spread it onto the layer of DeponitMix and cover it over with aquarium gravel. FB1 bacteria are activated immediately upon coming into contact with water, thus transforming the bed of the aquarium into an active bio-filter. Living humus bacteria pre-digest nutrients to convert them into a form that plants can use. For a quick, reliable start.