I have the same issue. 1/3-1/2 my display is frag racks right now lol.
I have 2 frag racks in my display, and I set up a 20 gallon frag tank in my basement because I ran out of room. I almost built a 16'x4'x18" frag tank last month. I decided to set up a 40 sps tank instead.... I'm kinda wishing I would have gone with the frag setup already and the 40 is still yet to be built.