I have some rock from an old tank, it's been outside uncovered for almost a year on a glass table. I wasn't going to do another tank but I have bought a 72 rimless. is there a chance that I can use that rock (if pressure washed) or is it wasted?
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Pretty much this ^^^If it was nasty then simply scrub it off , then cycle it in a small spare aquarium. It may take awhile if there is dead organics inside the rock ( dead bacteria snails pods ect )