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What he saidI think those are pineapple sponges, harmless filter feeders from what I've heard.
I started up my tank in June… caribsea live sand and new dry rock… I did purchase some cured plate rock and I’m making seascape by cutting and gluing dry rock. Now that i know what they are I suspect they will be with us for some time with addition of dry rockWhen silicate levels drop they will slowly die off. Silicates are usually from newer rock or sand. Sometimes tap water.