Tropical Science Marine/Reef Fishkeeper 8 oz The Fishkeeper��_s unique ��_and natural, drug free ingredients work to nourish and balance the biological system. Stimulate a fishes natural defenses by boosting its immunne system and ability to heal itself. Tropical Science Labs Fish keeper Saltwater Remedy. The Fish keeper's unique ��_and natural, drug free ingredients work to nourish and balance the biological system. Stimulate a fishes natural defenses by boosting its immune system and ability to heal itself