It’s a Gorgonian covered in algae. I’d take it and put it in a container with tank water and gently clean the algae off it before putting it back in your tank. That algae will kill it if it isn’t already dying
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20 Gallon SPS reef
29 Gallon FW "fat catfish" tank
20 Gallon Long Dart Frogs "Zig" and "Zag"
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