08-13-2013, 01:20 AM
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First off, I hope your fish recovers because your black molly is very pretty. I would agree don't use any product for reducing ammonia, just daily to every other day water changes until your ammonia comes down. I would check it every day with the liquid test kit. I would also agree a live plant may really help you out.
Platys and Mollys really create a lot of waste, so I would say that is a big part of your problem. Also with having all top swimming fish in your tank they may only eat food off the very top, or at least my platys and mollys do, and any that they don't consume off the top is sinking and creating more ammonia. Have you considered adding snails or a bottom feeder. Your size tank you could keep some ghost shrimp or other kinds of shrimp as well. Just think about it and research it as a possibility to help your tank out.
Gravel and artificial plants really trap in waste. Make sure you are moving things around and that every few days you pick up and shake around those plants because waste gets trapped in the plastic part that goes below the gravel too. We found that out when we had gravel and artificial plants just how much stuff gets down in the crevices.