this is my 20 gal.that i hooked up.it's a standard aga 20h that i drilled for a closed loop.it's run by a velocity t-3.that also runs a current 1/10th chiller.i also added a few hydor koarlia nanos which makes the flow about 50x turnover total.it is lit by a 150 watt giesemann novall w/a 20k ushio bulb.thats it i don't run any fitration on this tank.it's about 5 months old now and doing extremely well.check it out let me know what you think