<a href=showthread.php?s=&postid=13353809#post13353809 target=_blank>Originally posted</a> by alprazo
I agree that the assessors will likely hide in your system. They are the perfect nano fish, but in a larger tank I feel that they will not wander far from their home.
Did you look at the female swallowtail angel - G. melanospilus. Reef safe, usually a model citizen, always swimming in open water, relatively inexpensive, obtainable, and has a fair amount of yellow. They are also quite hardy, will clean the glass a little and eat from the water column. They are reported to reach 7+ inches, but I've never seen one > 5.
I also like the pyramid butterfly for you but they do grow. It is one fish I've wanted for a long time and will have to wait because I'm all stocked out.