I just put together a frag tank. It is 24x24x8. Only do zoas in it. I use a 120w evolution led. Use a eheim 1250 for the return. Have a 20g sump with lr, a 4+" sandbed and I skipped the skimmer. Made an algae turf scrubber. Have yet to see much if any algae grow in the dt itself. I keep a sole snail in there to clean what is in it. ATS is pretty amazing.