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Generally a pound a gallon works. Why are you changing to crushed coral? It will effect your PH and is very course, your bottom dwellers will not like it.
well, I've always ran crushed coral in my tanks and found that my ph is very stable. I'm thinking sand, but I don't want gravel anymore, plus I've got plants, so I need something that's not real heavy to keep the plants temporarily rooted.
it's on a basis of look. I'm looking to lower the ph with it. My ph is steady at 8.4. Not alot of options other than sand and maybe a dirt substrate which I'm unsure how to do.