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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I love my fish tanks to be big and beautiful. Majestic have always gone the extra mile for me with my extra big tanks. I will keep coming back. - Frank Zoka