Protects fish and plants reliably against harmful substances in tap water and adds important vital components. For nature-like aquarium water. The optimized formula ideally matches the care needs for skin and fins of your fish. Tetra AquaSafe Protects fish and plants reliably against harmful substances in tap water and adds important vital components. For all freshwater and marine aquariums. The optimized formula ideally matches the care needs for skin and fins of your fish. It Promotes vitality, as well as growth and well-being, with added iodine and magnesium. Finally it reduces stress and supports long term health with a special vitamin mix containing vitamin B.