you dont need a light for the LR only if you want to put chaeto so you'll need a refugium light and no im not using the powerhead anymore i upgrade to a Maxi jet 900 with a hydro flo but if you got the nano cube 2006 the stock pump will give you nice flow.
1 chamber>>> LR rubble and on top one sponge
2 chamber>>> LR rubble
3 chamber>>> heater, pump, only a piece of LR and a bag of chemi-pure.