I breed these little guys by the bucket full and yes the molly and platys will keep them in check. They are actually very cool little fish to work with. I can tell you that is you want to raise more, just fill a 5 gal bucket 3/4 full of auarium water, add some duck weed or not, and a trio or hit female. Within 60-90 days you will have 8-12 fish. I bred them in a kiddie pool and look out I have 100s.
If you're looking to purchase some I have a bunch, so p.m. if interested. Just and FYI, they live just fine with Endlers and don't cross with them.