Yellow Tang Help!

[Funky_Fish14]

Hey Everyone,

Last night I went to bed knowing that my tank was fine, all the fish were fine, etc.. and this morning I woke up to a yellow tang who currently has his lower fin torn at the bottom corner and a little piece from the bottom of his tail. Im not sure if it was like this when I woke up however. He just sits on the bottom or on some rocks and is sometiems leaning on something and sometimes sitting on the bottom but sitting straight up.

I fed him nori 3-4 times a week at first and in the past couple weeks it was only twice a week and I forgot to feed him any for the past week. He did have meaty food available though.

I had yet to see any fish ever be agressive to him, when I put the second largest fish in(the coral beauty) he(the tang) displayed to it and followed it around and kept displaying to it for 5 mins and they have ignored each other ever since. Tank livestock(minus corals and snails) includes:

1 Cinnamon Clown
1 Coral beauty
1 Yellow Tang
1 Dispar Anthias
1 Pajama Cardinal
2 Scooter Blennies
2 Engineer Gobies

2 Skunk Cleaner Shrimp
1 Sally lightfoot crab(Kicks any shrimp or fish that get near him, yes, kicks them)
1 Misc hitchiker crab that lives in a hole of a rock that leads to the buroow of one of the engineer gobies(So I doubt he is to blame for anything)
10 or so blue-leg hermits
5 or so Scarlet hermits
5 electric blue-leg hermits

I just watched him leaning on a blue-leg hermit and it had no interest what so ever in chomping down on him lol.

Any advice please help!

Also, is Melaflix something for helping healing fin damage? Thanks for any help!

Chris