The go with the 30W Nicrew. Great light! 30W HyperReefThe frag/grow out tank is on a 10 gallon. I had a black box over my 20 long and hated that it had to be soo high up over the tank. It look horrible in my opinion. I just cant justify spending $500 on lights for a 20 long with zoas, LPS, and a couple of simple SPS.