I've got a 30 gallon sump that I want to use partly as a frag tank for my zoanthid frags. I built a 12"x8" egg crate tray and have it set up about 5 inches from the surface of the water. If I use a single 24 watt PC bulb and put it across the width of the tank will that be enough lighting for Zoanthids only?? The light will sit about 6-7 inches from the surface of the water. My sump is pretty tight so I only have room the tray that is 8 inches wide.