That is a brain and should be on the sand bed. Im willing to bet that its getting to much flow on it and its peeling it away from it.
90g with refugium, dual 175w halogen, dual actinics+1 i believe its a Trachyphyllia , but I'd say move it onto the sand bed and in lower flow until it starts to heal. How long have you had this coral and if you could provide some info about your tank that will help to. What type of lighting do u have, tank size, flow, and water parameters.
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