Tropic Marin Carbon are highly efficient activated carbon pellets for use in fresh and marine water aquaria. The Carbon combats yellow matter an harmful substances from the aquarium water. Yellow matter and harmful substances have an adverse effect on the conditions in an aquarium. The water needs to be free of yellow matter if the light is to be allowed to penetrate unfiltered to the corals, plants and fish and bring out their natural colours. Tropic Marin Carbon is a highly efficient activated carbon with a powerful capacity for adsorbing yellow matter and harmful substances without releasing excessive amounts of phosphate and silicate.Tropic Marin Carbon+ highly efficient activated carbon to combat yellow matter and harmful substances+ powerful capacity for adsorbing substances+ for an optimum light availability in the aquarium+ only very small amounts of phosphates and silicates are released+ corals, plants and fish and bring out their natural colorsTropic Marin Carbon use and dosa