hi i have 3 albino cory, 2 julli cory and 5 harlequin rasbora , i was just wandering if it was a good idea to get ether 3-4 platys or mollies ??
any advice welcome
It's really going to depend on the size of your tank.
As for compatability platies will do fine with the fish you have.
Mollies should be kept in brackish conditions to thrive, though can be kept in freshwater with the addition of some salt. As far as I know the corys can't handle salt, but I'm sure someone will correct me if I'm wrong.
I would class that tank as fully stocked with it's current inhabitants...the mollys or platys would make it very overstocked. Plus being livebearers they may well start giving birth