I have 4 glowlight tetras (and 7 neon tetras) in my 36 gallon with my Sorority-In-The-Making, and I haven't observed them bothering the gals.
Feeding is actually much simpler than I expected...the betta girls come up to the top when I open the hood, and I just drop several pellets in front of each - they are pretty good about not being total piggies. Then I get out the mini pellets and sink a couple pinches for the tetras, who normally group up under the bettas when they see it's feeding time. There follows a mini feeding frenzy as they dart around snatching up the drifting mini-pellets. (Yes, the girls will normally nab a few mini pellets too)
The Glowfish are an unknown in terms of compatibility. But the glowLIGHTS seem fine. I do think you need a certain size school of them though.