fin erosion

What are these marks on the tip of my fishes right pectoral fin? He’s eating like a little pig and very active. He’s been in the tank 2 weeks. The tank is basically new and only has a few fish. All other fish no issues. No fighting. 4 foot 107 gallon aquarium. Thank you in advance...

Gem Tang help please! Eating like a champ. Not afraid of any tank occupants/not getting bullied. My current theory is bacterial infection from transport or something, that got infected. Had for about a week. Can’t see in photo, but there is a small area that is whitish near the base of the area...

I have caught him jumping through the net a few times which seemed to damage his dorsal fin a bit but it was only a small rip. I fixed the jumping issue and added a plastic lid. Recently i noticed the top fork of his tail wasn’t standing and was drooping now but now it looks the worst it has and...

Greetings all, I have 10 gallon fowlr cycled it for 30 days and added a blue damsel after 4 minutes of fw dip he was heavy breathing and got normal ate and started digging the substrate all of a sudden he was on his side with fins and gills are torn up he was heavy breathing and eventually...

I have a scopas tang that I got about 2 years ago and ever since then his fins have been eroding, I’ve tried pimafix, melafix, prazipro, copper power, vitamin supplements, none of those work. All the tank specs seem to be on point, all the other fish are happy and healthy, I feed him nori...