"i have a mixed reef tank(softies,lps,sps,clams), cleaner & peppermint shrimps, mandarin goby, yellow corris wrasse, exquisite wrasse, red anthias, mated true percula, sebae clown, yellow tang, unicorn tang, sailfin tang, lamarcks angel, foxface, a pair of bangai, pair of firefish, all sorts of snails & crabs, a sallyfoot."
Hmmm, I am not expert, but have seen my Niger Trigger in two different reef tanks. You can count on him to devour your peppermint shrimp. He will also most likely harass the gobies, anthias will not get any food (much slower / shy eaters than the Trigger) and will starve, will also nip at and eventually kill the firefish. He may even take out your Lamarcks, they are not that aggressive. You stand to lose a fair amount of your livestock if you place him in that system. If you alread have him in your FOWLR, I would keep him there. To keep a Niger, your tankmates must be equal size and aggressiveness. Tangs will be fine, and the clowns, but the rest will suffer. Good Luck.
-Dr Marco :sfish: