Sick Goby?

[lochi]

I've enclosed a pic of what appears to be some sort of sore in his nasal area. Not sure if its some kind of infection or if my Maroon clown took a swing at him. Treatment one way or the other? Help!

 

[beth]

He's a cuttie
How long have you had him, and what kind of substrate are you using there?? Sand, crushed coral?

 

[lochi]

He's been in the tank for 3 months but I kept an I on it at the lfs for a few weeks before that. I have a mix of live sand and crushed coral. I started with CC and tried to bury it with live sand. It didn't work so well and now its mixed. I know crushed coral isn't all that healthy for sifters but I've been paying pretty close attention to him trying to make sure it's not damaging its gills. WHatever happened, happened pretty much overnight.
Thanks in advance for any help you can offer.