Originally Posted by Bradman
Its mostly the Mollies, i seen 3 of them doing it in the last couple of days. And like i said im still sorta new to this so im not sure. Im going as soon as possible to get the water tested. I dont have the test kit..
OK, this is starting to make some sense, if it is just the mollies.
First, on the GH and pH of your water, this you can ascertain from the municipal water supply folks; many have a website with water data posted. If you find it and can't decipher it, post the link and one of us will check. Water params are vital to mollies, and the flashing might very well be due to this.
As for the ammonia, nitrite and nitrate, your fish store should be able to test these. But please ask them for numbers, not some generic term like "looks fine," or "is a bit high but OK" which tells us nothing. Numbers for tests, always, is crucial.
Other very important questions...how long have you had this tank running? And how long have you had the mollies? And when were the last new fish added, if other than the mollies?