Ideas for fish in a 30 gal cube

[marcingo]

Hello. Im looking for some ideas for a colourful fish for my 30 gal cube (reef).
I currently have a 55gal 4ft set up but since I have to move into an apartment I will be downsizing. I will only be keeping two of the fish from my 4ft since the others wouldnt be very comfortable in the cube. The two I am keeping is one false perc and one black perc. Is there any other smaller colorful fish that is reef safe I could put into the tank?

Also would my tube anenome be ok in the 30 gal?

Thanks for the input. By the way dimensions are 20 inch long 21.5inch tall and 18.5 inch deep.