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3 mm is recommended for aquariums inhabited by bottom-dwelling fish (the fine sand does not damage their skin)
it is produced with higher protein levels
COLOUR MAX is a highly potent colour formula containing pure cultured spirulina
or parasites like whitespot
Marine Pure GEMS 90g (up to 260lt Tanks) Pond 3 mm is recommended forHigh Performance Biofilter Media for Nano Tanks! Inert and chemically stable, MarinePure Gems are a great addition to any aquarium that needs more biofiltration. Bacteria prefer to grow on surfaces, and by adding more surface area in your aquarium, you will give more space for beneficial bacteria to grow and proliferate which can help reduce nutrients and maintenance. The Gems can be placed anywhere under water, in the sump, back chambers of an All In