i dont have experience with large angel, except bandit
AT did show some aggression for a few hours but now both live in harmony
sharing my experience in keeping AT, hope others can chip in too
1) wide swimming space, best >4 feet
2) strong waves, AT loves to swim against the wavemaker
3) due to 1 & 2, AT is always hungry, therefore required regular feeding
best 6-8 small feeding through out the day or a small red bamboo for them to graze
4) unless your tank is ich free, try not to keep another ich prone fish
eg PBT, else very difficult to control when there's an outbreak
everytime i add in a fish, any fish, there's an ich outbreak
that is why i seldom add fish
hope to see your AT soon