Originally Posted by TheTodd
I've never done Triggers, other than a Blue Throat (which are supposedly not as aggressive) and he was second to last, with all other fish his size or larger. I'd wonder what an appropriate size would be for adding the Tang down the road?
If you're looking to house them with blue throats, all but the smallest would be fine. Our local store got in a dozen hippo tangs not much bigger than my finger nail; I'd avoid that size.
Blue throats are (usually) less aggressive as you stated and are naturally planktonic feeders. As such while still powerful, they tend to have smaller mouths. If the tang is larger than the triggers mouth and your trigger isn't overly aggressive, I'd guess you would be safe.