I bought my first marine fish a few months back: a 5 inch rectangular trigger (Rhinecanthus rectangulus). He was in a LFS in a really small tank with only a sponge filter. They said they put him there cos he killed everything in the big tank. He has BIG personality which is what we liked about him and he's pretty. We have no intention of mixing him with other fish due to his history and he seems health and happy but we do need to improve his setup. Now he is in a 1m tank with external filter . We are prepared to provide him with what he needs for the long haul but every one has different ideas about what that is. I need advice from someone with personal experience. What does my trigger need?