You would want to have no less than 4 females... because with 3, you run the chance of 1 getting beat up.
As far as "glowfish", what do you mean? Are you referring to dyed fish? if so, don't buy these. They are chemically died fish and the process is cruel. This leads to them being susceptible to disease and dieing early. The color just fades away over time anyways.
If that is not what you are referring to, I have no idea what a glowfish is.
I think you could successfully keep some platys though. A couple pygmy corries would also be a nice addition. Just don't get too carried away with stocking, because a 10 gallon is just enough for a small betta sorority tank imo.
Hopefully some other people with sorority tanks about that size can jump in here and give you some more insight.