[T/A]

Thanks for all the suggestions, but that tank is no longer being used as a coolwater tank.

My three yellow "female" Platies have matured and one of them is finally showing his true sex. I thought it would be interesting to see what color fry they would produce, so I set up the tank for the two pregnant females.
On Friday I saw some fry, which I wasn't expecting yet, since the first batch was just 18 days earlier(they didn't survive the other fish in the main tank).
I now have only the 8 fry(maybe more) in this ten gallon tank. I moved the females back to the main tank as soon as I spotted the fry.