Hi Welcome to FishLore

Angels are gorgeous fish!
I don't know that much about them but it sounds like as they're maturing they're sparing for dominance. I'm not sure about their mating behavior, but this could be a possibility also.
I'm sorry, but imo, your tank isn't big enough for 2 angels.
I know you didn't ask, but your clown loachs will also get very big and need a larger tank.
Other members know more about them, so lets see what they have to say.
Edit:

Thanks for the info Nick. I wasn't positive.