i had a humu that i sold too my friend and when i first got it is was only agressive too me and would attck the glass and bite me once, but after 2 weeks or so it calmed down, it was about 4" and it lived with a snow flake moray eel with no problems i also sold my friend the eel and the two are living peacefully together still, picassos are one of the not so aggressive triggers, but they have a trigger attitude and teeth and could rip apart a fish, i dont know about teh dwarf angle, im sure the butterflys could be fine if they dont pester the trigger.
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