Packet of zeolite stones for use in aquariums. Zeolite stones have an adsorptive property that helps suppress the growth of moss inside aquariums, and will not have an adverse affect on fish or other aquatic plants. Please note that the zeolite stones will not have an effect on moss that has already grown inside the aquarium, and depending on the breeding environment, it may not be able to completely suppress moss growth. Zeolite Stone Aquarium 150g