Yes two hours before it was perfect. Best health last night. No bones in the fish. It was just a piece of whet flesh fish. I have fed that to the whole tank and acans included.Other than the 'problem' it is looking quite good.
Was it a whole fish you fed it?
Could it have been spiked internally by a bone?
I have two average Joe clowns, kole tang, bi colour blenny and a cromis. I don't think it would be the fish. More the pep shrimp. But the damage happened during the day.Thanks for the extra photo's.
What fish do you have? I wonder if a fish has taken a bite or two and the coral has then reacted to protect/repair itself?