promising. For warm water hexamita (and cool water spironucleus) metronidazole or Di-metronidazole are recommended. (It is also the human medicine Flagyl.) Such insight as I have comes from the Barrons Press book (and a speaking engagement) by Terry Fairfield, pages 92-93. That A Commonsense Guide to Fish Health, typical of many of their fish and pet books is not huge, but it has a lot to say. It also is not inexpensive.
Dr Fairfield does feel that overcrowding in a tank and the subsequent fish waste levels are what compromises the fish's immune system.
And (huge sigh!) yes Di- and Metrondazole are antibiotics and will trash the nitrogen cycle. I'm really sorry about that. Wish I could express mail 10 pounds of "seasoned" gravel in a few days to help get that cycling again. ;)
The presence of an anthelmintic will not further mess up the nitrogen cycle. It might get rid of as yet undiscovered worms though. (By the time we discover Camallanus, it is too late for some fishes reproductively.)
Thank you for double checking. I hope your fish thank you too. :)
And don't leave any finger prints on the piggy banks. ;)
All the best!
unc
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