I have a smallish Niger trigger fish in my 44g cube (soon to be upgraded to a 100g). He is probably about 4" long right now and I have had him for about 8-9 months and so far he has not bothered any other fish or invert although he will occassionally rearrange some rock or coral if he is not satisfied with my placement. Funny enough it is usually just new additions or if I move something he will move it back to the same area of the tank. He is housed with a tomatoe clown, blue devil damsel and a prawn gobie. Also a couple of cleaner shrimp, a peppermint shrimp and various snails, a clam and a variety of LPS and softies and zoos. So far other than wanting his house to stay in order has not bothered anything.
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