people say it can't or shouldn't be done, but you can mix all kinds of angles - acute angles, obtuse angles, right angles, reflex angles...
but watch out for straight angles - they're difficult, only for experienced reefers.
as for
Centropyge spp. - it's common wisdom that they aren't a good bet to mix. there's some argument that the frontiers of the hobby are advanced by bold fish-keepers who experiment with such arrangements, but mostly that's an excuse for being irresponsible.
