Zoo Med Excavator Clay Burrowing Substrate Treat Flavor_Pork It supports the optimal coloration

It supports the optimal coloration of the Koi

Flow at 9' -   95 gph

as well as deeper in the tank removing floating debris

The bacteria growing in the top 1/4" of the surface of the brick will be aerobic and will use up all the oxygen so that the inside of the brick goes anoxic or anaerobic

Two Little Fishies' Julian's Thing™

Zoo Med Excavator Clay Burrowing Substrate Treat Flavor_Pork It supports the optimal colorationIdeal for bearded dragons, uromastyx lizards, leopard geckos, sand boas and other burrowing snakes, tarantulas, and more. Allows reptiles to dig tunnels and burrows like they do in nature. Used for molding and creating multi level terraces in your terrarium. Holds its shape so burrows and tunnels will not collapse. Contains no added dyes, colors, or chemicals. Zoo Med's new Excavator Clay Burrowing Substrate allows reptiles to dig tunnels and burrows