General tonic.. Releases monatomic oxygen in safe amounts, improving fish health, vitality and colour.. Raises the redox potential oxygen levels in the aquarium and improves filter efficiency.. Assists in the break down of fish waste and plant debris, improving aquarium conditions.. Easy to use powder form. Does not dye silicon sealant.. Dissolved, paragon is even safe with delicate species even urchins, starfish and crustaceans.. Nb. Do not use with discus species.. Size. 200G up to 2500 litres