OhMattGod

Well im upgrading my 10 gallon to a 28 gallon. My tank is cycling as of right now. I already have a red tail shark. I plan on getting an Angelfish. What other fish might i get? Im thinking of 2 schools of fish?

TFA101

Are you transferring your barbs and tetra as well? If you do, your stock should look something like this if you're looking for 2 schools:

4 Tiger Barbs
3 Red Eye Tetras
1 Angelfish (choose your color variation [Black Marble, Koi, Silver....] )
1 Red Tail Shark

It's slightly over the limit, but frequent water changes (every 1-2 weeks) should help keep the tank stable.

zambize

It does sound over the limit, especially considering the territorial nature of the shark. He really needs his space or he can become quite aggressive, especially as matures. He may reach 6", and I've seen reports up to 7.5". I'm assuming your tank is around 24", and if so, a 6" fish will be 1/4 the length of your tank. Not much elbow room for that fish. To really enjoy this beautiful fish, keep him happy with as much space as possible, lots of unchallenged hiding places, and few tankmates.

Zambize