My acanthophyllia has had one side "pinched" up recently when expanded. I noticed this red spikey object under the pinched area on the skeleton when contracted. Does anyone know what this is, and should I remove it?
Foraminiferans. These are generally harmless, but after seeing that picture the tips of these could definitely be a little irritating. If you want to remove them just get yourself some tweezers and break them off. GL.