It is suitable for all freshwater & marine aquariums; when using Tetra AquaSafe in marine aquariums, however, the protein skimmer should be switched off to prevent large amounts of foam from forming. The care product encourages the settlement and bioactivity of useful bacteria in the aquarium, which in turn ensure clean, healthy water; it dissolves quickly in the aquarium water. Tailored to the special needs of fishes’ skin & fins; iodine supports vitality, magnesium promotes growth & well-being of fish & plants; natural plant extract protects fish gills & mucous membranes. Its optimized vitamin B mix reduces any stress that fish may experience during water changes and therefore sustainably supports their health. Tetra AquaSafe makes tap water safe for fish and reliably protects fish and plants against harmful substances contained in the water.