It sounds like someone in your cleaning crew might be eating your xenia. I had a nice xenia on a piece of live rock in my aquarium and it was very healthy - until bits of it started to disappear. It also looked like it was growing back at one point - but now I cannot find so much as a small piece of it. I am not sure what ate it but I am pretty sure that is what happened.
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PIER PRESSURE
28 Gallon Saltwater Reef Aquarium
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