07-11-2010, 11:05 PM
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Its possible that the deformed bodies had something to do with the deaths. I once had mollies that bred and the 3 fry that survived were very small, never grew bigger than a tetra. Anyway, if you saw no signs of illness, no ick or scale issues, and your water levels are fine, no ammonia or nitrate/trite spikes, it's possible it was just its time to go. The fish may have been old, or as said deformed internally, bad breeding etc. if you cant find anything wrong in your tank, I would not worry about it too much, as these things tend to happen. I would however do a partial water change if you suspect something to be wrong, or if the dead fish was in the tank long, espeically since it was attached to your filter as you dont want dead fish bacteria to cycle into the tank and infect the others. Hope this helped.