Mollies Sitting at bottom

looks like either fungus or columnaris (columnaris can occur on any area of a fish). i used maracyn plus and bumped the heat up to 85°F. visible symptoms cleared up in 24 hours, but it takes 3 doses (day 1, 3, and 5) with water changes in between doses. mine perked up after about 36 hours of treatment and is now as active as the rest of the fish. the fact that one died makes me think columnaris as opposed to fungus.

ps: keep your mollies temp around the tropical range for the sake of your cories (i saw the other thread). 78-80 will be just fine for them
 
the cories will be fine with maracyn plus. its not a salt based medication
 
you really should do a bit of research; it will help you in the long run. cories are scaleless fish. they tend to be on the salt intolerant side. that isnt to say that adding a little salt means instant death. but for the overall well being of your cories, the less salt the better. some people advocate adding aquarium salt to all tanks; imo this is not necessary and create problems in the long run. better to add salt as a tonic for an ailment (ich, etc.) than just to dump it in your tank. the mollies will be fine in straight freshwater from my understanding and the cories will be better off for it.

dont add any more unless you are going to rehome the cories. as you do water changes, the freshwater will dilute any remaining salt down
 
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