Ya it's tonga rock. I changed the rocks around to try and get rid of those clove polyps. I could'nt scrape them off nor did I have enough epoxy to coat them (too many). I put them upside down, I noticed they were'nt growing in the shaded areas. Hopefully that and the sandbed eventually kills them off. My fish sure like having more swimming room. Ya I wish some of my other sps would grow as quick as the purple acro.
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