I keep now two flame angels, one regal angel, one C. aurantius, one Genicanthus bellus and one Apolemichthys trimaculatus in a 135 g. Only the regal angel and the trimaculatus gave me problems with zoanthus (ate them all). I keep a lot of SPS (Acroporas, Montiporas, Seriatoporas and Stylophoras) and clams with no problem at all.
I have also had C. potteri and C. eibli and they behaved well with the SPS.
I feed heavily different types of pellets, flakes, frozen mysis, frozen brine and mussel.