I am running sump/fuge outside with G-6 mod recirculating, No3 sulfur, Phosphate Reactor, 1/3 HP JBJ, 4 x Tunze 6100 with 7095 Controller, AC JR controller, 500 watt Heater, 12 x T-5 bulbs ( 8 @ 54watt and 4 @ 39watt ) about 200 lbs of liverocks, no sand.