08-25-2011, 08:39 PM
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I agree with ladayen and the use of the medication probably won't do anything at all, except perhaps add further stress to the platies. I wouldn't recommend the use of meds. until you are sure what the illness is as they could just make matters worse. I don't see how a fungus remover helps with swim bladder/dropsy.
I noticed you said in an older thread that your tanks were cycled, but it doesn't sound like it (also noticed you are having similar higher readings in your 29g tank), If you are sure that the tanks were cycled, something is wrong and perhaps the cycle stalled for some reason, lost too much of the nitrifying bact., you are overfeeding, your filtration isn't sufficient or you need to revise your tank maintenance/water change schedule.
I would start by doing partial water changes daily to keep the nitrites/nitrates in check and syphon the gravel weekly.
If the bloating is related to pregnancy, Livebearers can hold onto fry until conditions are favourable, if the other platies fry were still-born, it could be due to water quality and/or stress.
Unless they have parasites, I think a lot may have to do with their diet and I would stop feeding the freeze-dried worms altogher for a while. Stop feeding for a day or two and after that only feed them once a day. Try to make sure they get a more varied diet, vegetable matter and include frozen baby brine shrimp and spriulina (either flakes or pellets), both those are also good for constipation and feeding a deshelled pea (cut up or squished) now and then is very beneficial for them.
If you can't take the carbon out, if it is a HOB filter with a cartridge that has the carbon encased in a grid behind the sponge, you can cut the little grid panels and remove the carbon that way (that is what I did in the past), or you can remove the cartridge altogher and replace it with some media sponge/floss, you can buy sheets/pads of it and cut it to size.