The tank size isn't mentioned, but jentralala is correct. If you have a true mated/bonded pair, they will repeatedly spawn and unless the tank is sufficiently large (no less than 4 feet) the other fish may well end up stressed to death, literally, or physically killed. A spawning pair of angels is best alone, a 30-40g tank works for this, if it is your intention to breed them.
If you're thinking just having angels without the breeding aspect, then a group of no less than 4, with 5 being better is advisable, in no less than a 4-foot tank. As for other fish, avoid linear small fish, like the Neon Tetra
, and these will easily be eaten by mature angels. The rounder disk-shaped tetra work fine, as long as you avoid the fin nipper species.
More info in our profile, click Pterophyllum scalare