pretty much i would say what everyone else is saying. You can try a small tang, tomini or kole would be great and be ok for maybe even a couple years if not its lifespan. In my 40 breeder i like to start out with tiny specimens and once i can tell they are too big for my setup they get to move on to bigger homes. im currently keeping a clown tang that is maybe 2.5" but he does seem to need more room so i will be looking for a new home for him soon. I have kept a 6" meredithi angel in a 40 breeder and due to its calm demeanor it was ok in there for a few months until i found him a perfect home.
Jose