No other fishes... Only 1 black niger trigger, 1 pinktail trigger and one tassle filefish... All get a long with the boxfish...
Kept them for quite long liao cant really remember, maybe a 3-6 months before losing all of them to ich... They are very suspecible to ich..
For non-aggresive trigger, you can try Melichthys indicus, Melichthys niger, Xanthichthys auromarginatus, Melichthys vidua... These are the few i willreccommend...