Ariel S Posted May 12, 2021 Share Posted May 12, 2021 (edited) I was cleaning my tank today, picked up one of my dragon stones and noticed it was black on the bottom.it’s not slimy. I had to scrub to get it off anyone know what that is? Harmful? Photo is attached. thank you in advance! Edited May 12, 2021 by Ariel S Link to comment Share on other sites More sharing options...
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