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

On Sun, 16 Nov 2003 20:03:52 -0500, "Kevin Murphy"
wrote:

Anyone,

I have an Amazon tank with three keyhole cichlids, two young angelfish, a
few cories, and a few small tetras.
Recently the largest keyhole developed a nasty looking ulcer on the back of
his head. He hides a lot, so he
could have had it for a few days. I did a 50% water change, cleaned out the
filter (Eheim), added some salt,
and turned up the temperature a bit, but he died within hours. I just
noticed a similar lesion near the tailfin of
one of the other keyholes. Any ideas?? Anything else I could do??

Pictures of the tank:
http://home.comcast.net/~zeno42/Amazon.htm

Pictures of the keyhole that died (the current ill one won't come out for
pictures):
http://home.comcast.net/~zeno42/DSC00029.JPG
http://home.comcast.net/~zeno42/DSC00030.JPG


Thank you very much,
Kevin Murphy