06-16-2012, 02:45 PM
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As long as it isn't velvet, I wouldn't worry too much. You don't need algae chemicals with platies, especially if you are about to get fry. Platies are great algae eaters. If anything, I would cut down feeding a bit. I hope you are also cleaning your filter with de-chlorinated tank water and not tap water.
Turn off the lights and put a flashlight on your fish. If there is gold dusting, you might have a velvet issue.