Thanks Chris,

I ran Nitirite, Ammonia, etc tests but everything looked fine.
I am trying an antibiotic treatment with regular water changes.
Shall see what happens.

Thank you,
Kevin

"Cris" wrote in message
s.com...
Ulcers are primarily caused by baterial infection, which is most often
caused by poor water quality. Treat affected fish in a hospital tank
with a gram negative antibiotic like kanamycin, tetracycline, anything
with furan, or maracyn-2. These antibiotics will also kill the
nitrifying bacteria in your tank. Most of all, keep up with weekly
water changes!
Cris