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Ok I will pull that second one out and keep an eye out for more what is the id on that fist thing it goes in and out of that shell that's attached to the rock.
They are fine. the reason some say they aren't good is because they can irritate a coral it's attached to when it's right on top of it. Yours isn't in close proximity of any coral and it's not going to move, so it's fine to have.