Hey! I just went to my lfs and bought a slab of rock, and when I got home I realized it has lichen growing on it. I think they just sliced up some big boulders. I'm now worried about sticking it in my reef tank. I really want to because I've been needing a rock like this for a while, but I'm nervous to do so since I don't want to harm anything. I've heard of the "vinegar test" but from what I understand that's just to test PH. Anything else I can do? Thanks!
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