09-21-2011, 02:52 PM
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Ok, I'm going to weigh in with a recommendation based on having a similar issue. I don't know that you have the same issue but...
Some of my guppies in my 29 gallon tank were dying with no visible cause of death, some had what appeared to be dropsy before death. Other fish I placed in the tank (multiple danios, a dwarf gourami, and young common pleco) died with no visible indicators, they just quit eating and wasted away. I started doing frequent water changes (every day about 60%, including a gravel vacuum) and the death rate slowed, but did not stop. Shortly after this, Angelfish in my 55 gallon tank showed very visible signs of camallanus worms. Interestingly, the guppies had been housed in that 55 temporarily before I set up the 29 gallon. The frequent gravel vac and water changes in my 29 seemed to lessen the worm infestation rate.
Anyway, I treated all my tanks for camallanus, the unexplained deaths stopped, and I have not had an issue since. From my reading, it appears that guppies are common carriers of this internal parasite, but they don't necessarily show the obvious symptoms (worms hanging out their vent opening). I'm not advocating a "shotgun" treatment approach, that can cause problems of it's own! However, if all else fails and your water quality is good, you might want to consider a prophylactic treatment for internal parasites. It's part of my quarantine tank routine now. I don't ever want to deal with that again in my larger tank.