One of my cories has not looked right since I got him from Petco. At first I thought that it was nerve damage to his barbels from being on the rough gravel, and due to a malfunction of my QT tank I had to put him in my 15 gal. after only 1 day. He seemed to be doing fine, then I noticed that his mouth looked funny. Today I woke up to find that his mouth is completely disintegrating. He is having trouble breathing and is in obvious pain. When I saw him so disfigured I immediately assumed that it was my fault, SCREAMED, jammed my feet into my shoes, and ran 7 miles. Then I realized that my first 3 cories have been fine since summer. Remembering that he never looked right, I think something was wrong with him from the start. I have never heard of this before, and I don't know if it is contageous at all. I don't think he can eat anymore. Should I put him down? If you can help, I really need help ASAP. Thank you.
Oh, I know you are going to ask so..
-15 gal planted tank with 6 cories and 1 male guppy
-weekly (sometimes every 5-6 days) 20% water changes
-he is one of 3 new fish, the others appear fine
-no larger tankmates that could have maimed him
-temp. 76-78 degrees
-some algae problems in tank
-tank dosed with flourish and flourish excel as directions imply
-eco-complete gravel (I thought this was the culpret at first, but all the others look great and have been on it longer, also this fish was wierd from the start, prefering to munch algae and rest on the driftwood instead of scurrying around the bottom with the others.
-fish has no other symptoms than otherwise stated (well, his gills look reddish)
I think this covers it. PLEASE help!