Lots of light, and medium to high flow. If you broadcast feed mysis or other meaty foods, that's probably enough for them to catch and eat. I've had mine get HUGE (disc 12-inch across, tentacles another 6-8 inches) which can be a problem if they are near anything else -- they love to sting. Feeding them directly is fun, especially bigger pieces, but in my experience it can cause drama -- either health goes bad, or they split.