a foot long Dragon Wrasse head sliced open

[Bushido]

I got a foot long Dragon Wrasse last night. He is just amazing and slept in the 4" sand head stick out with slime coat.I noticed no one get close to him and one of the eels even freaked out when he touched the slime coat and swim away.I noticed he's got about 1" long 1/4" wide sliced open wound x2 on his head this morning. He is good and swimming like nothing happened. I have 2 big hermit crabs about 3" wide and the red one is pretty aggressive. I can't think of anyone else did that. I know puffer could nip but it's not nipping mark at all.I took hermits and brittle star as they are all I can think of and put them in sump.
Anyone think hermits would do that? I appreciate your thoughts.

 

[Pufferpunk]

Add Melafix to keep it from getting infected & help with the healing. It'll leave less of a scar, too. Vitamin C will also help it heal & keep it's immune system strong to fight off infection. It also aids in collagen production in the new/healing cells.

What kind of puffer & how large is it? How large is your tank?

 

[Bushido]

Add Melafix to keep it from getting infected & help with the healing. It'll leave less of a scar, too. Vitamin C will also help it heal & keep it's immune system strong to fight off infection. It also aids in collagen production in the new/healing cells.

What kind of puffer & how large is it? How large is your tank?

Thanks I'll get Melafix. I think you know what I got lol. I got dogface and mappa. they are 4". 300 gallon tank.the open would is like sliced. not chunk bit off so I don't think it's puffers.