Possible isopod

[Pridedcloth3]

For a few months now I've had random marks show up around the head area of my surgeonfish that heals by the end of the day but reappear every other morning. Originally I thought it was a result of it and my six line but even now I see them square off but nobody ever makes a move then I thought about the fact that most of my rock came from tbs and when I order from them. I select "if it's on the rock it stays on the rock" which did score me a mantis shrimp but I'm starting to think there's a parasitic isopod in town and I don't how to verify it or how to go about removal. The fish eats fine and is in good health but I feel as if somethings going on at night.

 

[Crabs McJones]

Does the fish sleep somewhere that can be seen after lights out? See if you can catch what's going on while the fish is sleeping

 

[Pridedcloth3]

Does the fish sleep somewhere that can be seen after lights out? See if you can catch what's going on while the fish is sleeping

That's the weird thing when I first got it out 100% slept in the left rear of the tank behind the rocks now at night I catch it under an overhang clearly awake. I try not to bother it but may have to