All you need in your sump / refugeim is a softball size of Cheato lighted with a clamp light fixture, using a 60 watt 6500k power compact bulb. Within a few months your Cheato will triple in size, which your tank will benefit from the filtering properties of the Cheato. If you want to add some rubble rock, to your refugeim, that would also benefit your tank as well.
Thanks,
Randy