Ok, I have had them for about 2 weeks. there are also some balloon mollies in the tank(1 boy 3 girls) its interesting because they kind just now started grouping togather with their own kind. but it seems both groups have left out the smaller females(platies and mollies) I made the usually beginner mistake of not letting my tank cycle without fish (only 1 week without fish) but I have been making 20% water changes since on a regular basis (every few days) have a pinquin mini with bio wheel. put aquarium salt in with initial setup and then 1/2 a tablespoon after 2 water changes(4gal changeout) Actually the little balloon molly looks really fat! alot fatter than the other females. Maybe she's going to give birth, she's not hiding just hanging out at the surface and not being social.