If my observations are somewhat on target, I'm thinking the two biggest
stressors are overcrowding and water temps. If you're having this problem in the
summer, my first guess would be too warm of water for cool water species and
too cool of water for warm water species. I've noticed that mollies do not
tolerate cool water very well nor do my dace tolerate warm water very well.
Unfortunately, I don't have successful experiences at reversing the white spots -
once my fish get them, it's usually only a matter of time before they die.
Now, I'll sometimes have a few fish within a group that don't get the spots and
once the crowding/temperatures are corrected, those remaining fish seem to
survive o.k. until there's another stressor and then the white spot infection
starts its cycle all over. I'd say avoid overcrowding or keeping fish in waters
that remain at temperatures at the edge of or beyond their comfort range and
you may not get it in any of your other fish, but as for how to treat fish
already infected, I can't say. Once my fish have become infected, it has just
been a matter of time until they die with the exception of some sunfish that
survived after receiving a salt and/or salt water bath.
Bruce
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