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What red stones are there in the water for raising arhat fish? What's the use?
Volcanic rocks have the following main functions.

1 temptation color

2 stable PH value

3 increase the hardness of water body

Increase the area of biological filtration, that is, cultivate nitrifying bacteria.

Under the illumination of light, volcanic rocks can reflect red light, but Lohan is more ornamental.

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