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Limestone gravel and marble

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I have some of this lime stone gravel and a few small marble chunks lying around from various gardening projects and was wondering if they are safe to use as part of an aquascape. Just as accents to the rest of the substrate, which will be mainly just black diamond blasting sand and maybe some lava and river rocks for plant anchors. This will be using tap water (8.2 pH, GH 10) in a tank for only Neos.


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Your shrimp will be living on the edge of tolerance, which may lead to molting and breeding issues. Have you considered a dirted tank the soil would probably help to bring the pH down with all the tannins.

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