The active oxygen block will dissolve slowly in water and release ingredients that will help maintain a healthy environment for your fish. As the block dissolves it will replenish the oxygen supply. Replace the block with a new one when it has almost dissolved. This product will also help stabilize pH.
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Just a quick note to thank you for the great service you have given me and to let you know all the fish arrived safe and alive. I am very happy with them and look forward to dealing with you again in the near future. - Dave P