If a pair forms they will torment the remaining angel or 2 non-stop. Tearing fins is common, losing an eye can happen, occasional deaths are not unheard of. In a larger tank say a 55, there is more room for the pair to establish territories, and for the other angels to escape to. A 29 is too small for this. Males and females can get equally aggressive.
If this happens, there are a few things you can try. Easiest is a divider, though these are kind of unsightly in a show tank which is what it sounds like you are doing. Split up the pair, putting one in a different tank, or trading one in to your lfs. The shops by me are always looking for large angels, they move quick. Get a larger tank with the hopes of the pair not being so brutal that they need more room than that. In a larger tank you can set up plants & such as sort of a natural divider. Out of sight, out of mind.
Remember that angels are cichlids and do have that temperment, especially when breeding.
Tolak