Sumo Loach skin peeling/rotting? Help?

[jawasnack]

Oh Man! Just when I thought things were going great, I wake today and notice my new Sumo Loach (little over 1 week old) has a spot in the middle on one side where it looks like the skin has either peeled or started rotting away and then a 2nd spot close to the tail fin on the same side!!! I can show you a picture of him from yesterday, but it won't sit still for a photo today! Help!
:huh: Poor Sumo it looks terrible!!!

 

[fish-n-chips]

Water parameters?
Water temp.?
Anything new added?
How long has tank been set up?
Water change schedule and percentage?
Give as much info as you can for the tank it is in.

 

[jawasnack]

It's been setup for almost 7 months (36gal bowfront tank)
Temp: 77
Parameters: PH 7.3 others I have no idea (I know, that's bad)
Water change 25-30% per week
New additions: Mexican Dwarf Cray and 5 Black Cherry shrimp and 3 Dwarf Lilly Bulb Plants in the last few days
Tanks mates : 20 Cardinal tetras, 1 balloon Molly, 3 Amano Shrimp, 5 Ghost Shrimp and 1 Kuhli Loach.
And a metric ton of plants

 

[Jeremy Smith]

Sounds like an injury, are there any sharp decorations such as rocks ceramic or plauseble the crayfish.