Pleco Stomach Rotten :(

I'm going to suggest going the antibiotic route on this one although to be honest I've never had to treat something like this. It's likely that there was a wound that allowed a bacterial infection to set in. A dual approach might be a good idea. You can treat the wound topically with neosporin or another type of triple-antibiotic ointment.
You'll want to back that up with some internal medicines as well. Metrondiazol (Metro) works well for a lot of parasites and protozoans if you suspect that, I also personally prefer Furan 2 as a general antibiotic since it treats gram negative and gram positive bacteria. I've had no complications using it in combination with metro but pay attention to the dosages.
I've read some suggestions of adding some salt as well, but I don't know that it's more than a chicken-soup type treatment once you've shifted to heftier antibiotics

If you can treat your pleco in a bare bottomed quarantine tank that would be best since there would be less of a chance of the substrate continuing to irritate the wound. Once it's open, even nice round gravel can cause some irritation.
 
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I think it is getting worse. I took this photo this morning.
pleco2.jpg
 
Haven't looked on planetcatfish.com but will give it a try. I think I'm going to take the pictures to the local fish man and see if he has any ideas. Thanks for your help everybody. I will keep you all updated on treatment and condition.
 
Hello,
Got my response from my friend Bob at MAS.
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Hi Sigi,
It is a fistula of some sort. It may have been caused by a penetrating wound with or without an abcess or a disease such as tuberculosis. It could also be result of gastric or intestinal rupture with subsequent infection of peritoneal wall progressing to a fistula.

It appears to have healed.
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If it appears to be worse, I would treat with antibiotics.
I hope he gets better. Pls. let us know what is happening.
 
I couldn't enlarge your last pic, but if it is getting worse, please get treating with an antibiotic so you don't lose him. If it were me I'd use the Maracyn and Maracyn 2 together. That way you're treating gram negative and gram positive bacteria, and...these two meds are designed to be used together.
 
Treated with Marycyn 2 today. Hope it gets better. I'll keep you guys posted on his recovery. Thanks for all the help.
 
pleco3.jpg

Here's what he's looking like now. Don't know if its any better or not. The spot has gotten red in it. He still seems to be in good spirits though.
 
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