I have just recently put together a 20 gallon tank that I was letting cycle before introducing the fish. My boyfriend, who was trying to be sweet, went and bought a bunch of fish and put them in to surprise me. Now I have 2 dalmation molly's, 2 black molly's, a rainbow shark and 10 various platy's all in this tank! Oh and yep, you guessed it, they are all in pairs! A male and female of each! In addition, someone had velvet, so now they all have it! I've tried treatment, and it has helped some, but I need advice on what to do! Also, I'm pretty sure all the females are pregnant. What do I do?!?!