currently keeping a 3.5" clown with a 4.5" niger and 4" white tail trigger. That was a fun fun procedure for grouping the trio of those triggers in a 135 Long. In the tank is a full grown snowflake a yellow tang and hippo tang, and a balls to the wall porcupine puffer. The triggers were acclimated using a 45 min drip with slight meds to ensure no parasites and than 45 minutes without meds with just clear water. I usually get a 10 gallon water change out of a new fish acclimation. But first was niger and a year later white tail and 6 months later a clown trigger. Whenever I add new fish to this tank, besides picking aggressive tank mates I put in seaweed on pvc and my clown goes bonkers when pvc is in his tank, he starts shredding the seaweed and if I do to pieces he will be preoccupied till the next night and never bothers new fish.
