companion

Hey guys, I have a 55-60 gallon tank, I’m looking to get another mate(s) for the tank. I have 10 tiger barbs about an inch or less in length and 2 3 inch Pictus catfish. All are doing well together. I have two pleco as well.

I want to do a tank with one betta and some platies and maybe mollies.  Are these good tank mates?