The Serenity 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 almo
The Serenity 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.
SIZE: 20g
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