Im in the process of setting up my frag tank now. Im using a 20 gallon high with a T5 HO
24Wx4 light, 2 250gph powerheads, biocube protein skimmer, and a heater. Im running a open top but with eggcrate in place. I'm also using a diy auto top off. I just finished up my eggcrate frag rack as well.