I have a 125 gallon FOWLR. I have 3 chromsis's, 2 clownfish, yellow tang, blue hippo tang, 6 line wrasse, sunrise dottyback, 1 chocolate chip starfish, 8 turbo snails and 4 emerald crabs. I use 4 36" T-8 lights. 2 lights are Marine-Glo actinic and 2 lights are 10,000 K. Seems to work great for me.