07-07-2013, 03:10 PM
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I would not replace the dead molly, just in case you might think of that. This is only a 10g, and as another member said in your other molly thread, molly really should have 20 gallons or larger. They do get large. And they need very stable water. Plus you mention fry which will need culling out soon.
Your mention of 20ppm nitrates in both threads is a possible concern; you also say well-planted, and with plants I would not expect nitrates above 10ppm, and likely lower. Molly are sensitive to these, any of the nitrogen forms (ammonia, nitrite, nitrate). If mollies are subjected to cycling or a new aquarium, they may live through the initial stages but usually succumb down the road. They are not a "hardy" fish by any means, compared for example to guppies or platies.