I would honestly bail on the Rhino Pleco to much waste. I would get a smaller one like a Bristlenose or Green Phantom Pleco. Then I would lower your fish choices and increase school sizes and i dont like angelfish so i wouldnt reccomend them they are very boring IMO
. Also i wouldn't get a betta he's gonna get nipped by your barbs my stock would be something like.
3-Bolivian Rams 1 male 2 female
1- BN or Green Phantom Pleco
6 -Red Glass Barbs
4- Zebra Loaches
1 -Red Tailed Shark
6- Long Fin Serpae Tetras
6- Black Skirt Tetras or Fruit Tetras I just don't buy those since I don't like buying dyed fish its unhealthy and they don't live that long IMO
. But you can get whatever you want there whether it be Black Skirts or the Fruit Tetras.
Btw your tank looks nice and good luck with it.