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I purchased this rock from a LFS and now I’m wondering if it’s even reef safe? I can see crystals in it, almost like a granite. Would that mean there are metals in it as well? Thoughts appreciated!
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Looks fine to me, but I can't see what concerns you. Do you know what type of rock this is?
The dark patches on the left piece could be some decaying matter.
Break off a small piece and stick it on vinegar, that'll tell you if it's calcium carbonate baseI purchased this rock from a LFS and now I’m wondering if it’s even reef safe? I can see crystals in it, almost like a granite. Would that mean there are metals in it as well? Thoughts appreciated!
Break off a small piece and stick it on vinegar, that'll tell you if it's calcium carbonate base