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This was my first guess as well, tank looks pretty new. But 8 months should be established. What l8ghting do you have him under? If flow is an issue he would have let go and moved around, but you said his foot is firmly planted...hmmmmmIt appears to be a very young tank. Is that correct?
That can cause issues.
Have you tested ammonia ?
Are you using rodi water?
Reef Roids with PE Mysis.
Lighting is T5's, 3 Blue Plus, One true actinic.