Best type of corals for smaller tanks

[Enigma]

I would avoid anything that sends out sweeper tentacles. One has to leave too much room around them. Plates take up too much room on the sanded, and they can be aggressive (and I've read that they can move themselves), so avoid those too.

I've had wonderfull success with acan lords: even when my display was a 10 gallon. The acan echinata can be aggressive, so avoid those ones.