You could try some zoanthids or maybe a montipora or something. I have a pretty good mat of gorilla nipples zoas growing on the back of my tank.
I'm considering montiporas. I'm buying a Nero5 from a local reefer soon and I'm going to probably have to change the aquascape placement after I figure out the flow pattern. Seems like montis always have pods crawling under them and I want to boost their population in hopes of getting a Mandarin in the tank.