I have general experience with angelfish in general. I would not recommend having multiple angels in one system, but your tank is rather large so it is possible and easier than people think. You just have to be prepared to remove a fish if things get rough. I also need more information how many tangs do you have, do you have other fish? I need to know more about this stuff so more information would be appreciated. Normally I would be concerned about corals, but Genicanthus Angelfish are considered to be reef safe. I would not recommend two angelfish in the same tank especially two Genicanthus Angels, but it can be done you just have to manage the fish and keep and eye on them. But make sure to be ready to remove a fish as soon as you see pimped up aggression.