Okay... here are pics:
<--sorry for the distortion in this one, it was taken while he swam past one of the corners of his hex tank
I didn't get any closeups of his dorsal but it looks like someone grabbed it in 2 places and just ripped it halfway up.
FLB -
I haven't put Stress Coat in, I didn't have any at home....I do have some at work tonight, I can take it home with me when I go.
It's entirely possible that he could be irritated with some finrot he had going so he started nibbling on it. But it's on the dorsal, too. Can they get at that?
He has no decorations in his tank that he could hurt himself on. He does have an archway, but that passed the nylons test so that's not it, and I also have just one silk plant in it. That's all.
I did rinse off everything when I did the water change with scalding hot water - the rocks, decor, plants, everything.
He does have a case of finrot - the ends were starting to get black, so that's why I had used MelaFix. I suppose the OD of that stuff just started a snowball effect, eh?
I do have tetracycline at home. I don't like to use that stuff except in extreme cases, but his tail is looking pretty bad.
SOOOO...
After blabbing on and on, here's what I think I will do when I get home:
A ) Give him a salt dip (should this be really concentrated, or just the norm - oh heck, just tell me how much salt in how much water or I'll probably OD him on salt too!)
B ) Dump in some Stress Coat
C ) Give him a 100% water change while he's in the salt dip
I think I'll give it a few days before I try the tetracycline, but if I notice it's getting worse by the hour I'll get him going on that.
Yes? No? Other ideas?