We have one black angel that's probably silver dollar sized, who was our original angel after establishing the tank (4 months ago or so)...n now we have 3 platinums (added 3 weeks ago) lost one yesterday due to aggression, that are between nickel n quarter sized...
None of the platinum angels seem to be pairing off, and they aren't the ones being aggressive...our larger black angel, on the other hand, is going after the platinums but leaving the 4 gourami (approx. 2") alone.
And the type of aggression...the black angel keeps chasing the other angels as well as nipping at them..