11-21-2013, 01:12 AM
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Well, it sound like your tank may not be cycled completely and the weaker fish are slowly dying off. Also, what are your water perameters? Mollys need salt and lower temps than many tropicals. If the temp is over 75, back it down. It seems the higher the temp the faster issues become critical. You said that there were no other signs of disease. Make sure they are not shimmying side to side, or that their gut area just in front of the anal fin is not collapsed. Shimmys are slime based infections and sunken guts are typically poor husbantry likely way before you ever laid eyes on them. Also where did you buy them?