I see that a bunch of Stylocoeniella just posted. Don't sleep on them especially as they are a fantastic coral to glue to your overflow / back of the reef as they will eventually create a living sheet that will cover any surface. I would even mix and match as they are all the same species and they won't bother each other as they grow up to each other.
It's super cool to watch! I promise!
How do Stylocoeniella rank on the “easy” to “expert” scale? Are they pretty demanding? I haven’t kept any encrusting corals, SPS, etc. in many years, but it might be cool to try and grow something on the back of the tank.