Achilles Tang help

[mfatgg187]

I came home 2 days to find a chunk of my Achilles' dorsal fin torn off. He's the most dominant fish in the tank so I don't believe he got into a fight with anyone but i ain't exactly sure what happened neither. I made a huge drunken mistake by just putting him in the tank immediately after buying him from the LFS, but that was a year ago. He got ich along the way but by feeding him food soaked in selcon and vitachem and garlic, he's fought all that off. But now his fin is ripped and he's starting to get ich again. To the best of my knowledge I have yet to lose any fish to ich. He's still eating like a pig and his behavior is still pretty much the same, but he's just a tad more cautious due to his ripped fin. I'd rather avoid stressing him out more by trying to catch him and also with all his bones sticking out, I'd also not want him to get tied up in the net which would be even more stressful. I have a reef tank so was just wondering if there's anything I can use or do to help him heal based on the decision I made to leave him in. Any help and advice with be greatly appreciated.

[PROX]

Wavemaker?

[dnsfpl]

i will stick to routine if it is still feeding well

can consider 10% more water change

too much is no good as AT is really sensitive

cheers