I have never seen a bala labeled an apollo shark.
RTBS, rainbow/redfin, and whitefin sharks would be great. They do not tolerate other fish well when they are in very small groups, however in large groups of 5 or more, they are generally very placid towards other fish. If you get the offshot chance of them breeding, then they can be very aggressive, but this is quite rare. I use to keep a school of 12 mixed between the RTBS and whitefins in a tetra community tank, and never had one problem with them being aggressive, and never had them breed.