i had everything from one inch clowns and damsels to butterflys,angels,wrasses and other triggers and tanks and lions and puffers.I had various one from 1.5" to 8".And i know people on hear that have had 10" + ones with no issues, although i don't think at that size they were with any real small fish but there was no aggression with them.Not saying you wont have a issue as with any triggers there is a chance.But from what i have found as long as you keep them well feed and lots of room and rock work they can be fine.