Well I bought 3 new smaller angels today. They are about 2 inches each. So far, my big male is the only one that seems to have an issue. The only time he messes with them is when they come close to where the pair lay eggs, and he will just chase them for a second then turns around and loses interest.
If I start to have more problems I'll move them to my spare 29. It's neat watching them. I never knew angels liked to be in groups and the 3 new ones all move together.