Sorry for being hasty, I was on my way out... Anyway, tank is standard 55 gallon AGA. 48" long by 13" wide by 21" high. 4-5" deep sand bed, 90 pounds of live rock, 2 ocellaris clowns, 1 royal gramma, 1 neon cleaner goby, and the usual cast of hermits and snails. Lights would be about 3 or 4"...