No. They are very different fish and require very different living conditions. You want at least 10 gallons (20 or more is better) per fish, because they grow so big, and the tank needs to be tall, 2.5 to 3 feet tall, as Angels take up a lot of vertical space. They do not turn as easily as Betta, so planting would be different, not as dense, and they leave a very heavy bio-load. Added to the physical differences, Angels are territorial and will fight with other fish for control of a space. They actively patrol and guard their area, so the betta is always at risk of being attacked. Put simply... they won't be friends. They'll nip each other's fins and the angel will probably win, they have fairly strong bites and heavier bodies.
Last edited by MollyJean; 04-18-2012 at 03:34 AM.