sera Plankton Tabs Nature is the color food without dyes and preservatives in tablet form. The gently processed food tabs are suitable for all fish that eat at the bottom (e.g. catfish, loaches) and invertebrates in fresh and marine water.The natural color development of the animals is supported effectively and in a natural way by zooplankton (7% krill) and phytoplankton (24% spirulina) as well as other natural ingredients.The excellently digestible food furthermore supports healthy growth, strong disease resistance as well as fertility. The tabs sink down quickly, keep their shape for a long time and do not pollute the water.