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Crushed oyster shell is essential for raising the water hardness in aquariums. It helps to maintain a stable KH which in turn helps to keep a stable pH.
The shell grit may be use in aquariums over short or long periods to alter the hardness to a level where a buffer can be used it is advisable in fresh water aquariums to place the grit in a nylon bag so it can be removed once the level required is achieved.
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