Go for domesticated angels. Altum angels are wild or close to wild, I don't know if they're more aggressive, but they're more fragile and require a lot of simulation of their natural environment to be okay. Any domestic angel will get along with another domestic angel.I think having 6 angels would be really cool! And just to make sure, any kind will be ok. Not just with the the other angels but with the small fish to? I think I heard altum angels where more agressive? Is this true?
I like the half black, black and koi angels
The stocking list seems fine.
I wouldn't say you're "guarenteed" a pair by getting six angels. It's highly likely, and they will get aggressive during breeding, and that's not my area of expertise. Some angelfish/discus person is sure to show up on how this works. But angels are oftenly kept in groups of 6, as are discus, and usually a pair or two does form, but no course of action is really taken against it to my knowledge. I'm no breeder, though.I'm worried. If I get 6 angels I'm guaranteed 1 pair probably even 2. Won't thy get super agressive to all fish when they start to lay eggs?