Usually my zoas are open and happy but they’ve always had this stuff inbetween them thats really obvious when the polyps close up any idea what it is?
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No I know about the tube, it’s just the gray rock looking stuff thats inbetween the zoas. They seem to be pushing the zoas or something.Are you referring to the tube? If so that's a vermited snail PEST!
You're going to want to break the snail tube and put reef/super glue over the space it occupied. Use gloves and watch out for palytoxins.
Let me know if you have questions happy to help.

