Aquarium Pharmaceuticals Proper pH Adjuster automatically set & stabilize pH to desired level. Easy-to-use, fast dissolving powder that automatically sets and stabilizes pH while neutralizing chlorine and detoxifying heavy metals. Contains aloe vera and electrolytes to reduce fish stress. Use when setting up aquarium or changing water. The 6.5 is for tetras, discus, and angels. The 7.0 is for community fish. The 7.5 is for goldfish, mollies and guppies. The 8.2 is for Saltwater, brackish, and African cichlid aquariums. Aquarium Pharmaceuticals Proper PH Pouch - pH Conditioners