Rainbow Boom Combo Chalice3" x 3", WYSIWYG and fully conditioned to life in an aquarium by WWC. This chalice is perfect for the lower section of a mixed reef with par around 100 to 155 and low to medium low flow. We also recommend to target feed this Chalice a tiny amount once a week, but only when it's feeding tentacles are extended a little bit (this usually occurs while feeding your fish, or before the lights come off or before they turn off for the night.) Lighting = Low