Add Homonym wrote:

OK. So, the ich is small white spots. Sounds like cryptocaryon.

Yep.

take ALL fish out of the tank for 1-2 months. Take the infected fish,
give it a dip in freshwater buffered to PH to match tank water, with
formalin and copper sulfate added. I usually add some methe;yne blue to
help boost oxygen, since it is also an anti paraiste and won't hurt.
After the dip (dip for about 7-10 minutes) put fish in a seperate tank
and continue treatment with copper sulfate until all symptoms are gone.

I don't use the dip - just go straight to the hospital tank dosed with copper
sulphate. I prefer "CopperSafe." Also get a decent copper test kit that works
with the type of copper treatment you're using (I use "FasTest" with
"CopperSafe"). If you're going with CopperSafe, add half as much as the
directions say to add, wait an hour or two, and test the concentration. Add more
in stages until you get up to the recommended dosage of .15 to .2 ppm. Maintain
that level for two weeks and then quit adding copper.

The freshwater dip is a bit satisfying, though. The parasites swell up and sort
of explode. On the other hand, the fish isn't exactly comfortable either.

George Patterson
If you torture the data long enough, eventually it will confess
to anything.