Good coral to glue to a Magfloat?

I have a 150g reef that currently has LPS corals along with a bunch of palys/zoas. I have an extra magfloat that I would like to use to mount something on the back in the upper strata of the tank. I am running 6 x 160w VHO bulbs on the tank. Any suggestions for something cool I can glue to this magfloat for the back? Either something that has the potential to overgrow the mag and go onto the glass or something that will branch off the magfloat out into the tank (again, I would kinda like it higher in the tank).

TIA!

 

Green Star Polyps or Clove polyps. They will both grow over the magnet and onto the glass. I have some GSP on the back of my tank that I used magnets to start. I used much smaller magnets from BRS though.

 

alot of people put plate corals..and look pretty cool

 

GSP would look awesome.