:notsure: dang you're asking a lot of me, well i have a 40 gal. sump ,live rock in it. excalibur protein skimmer, 6 power heads , 2 175 mh , 440 watt vho's. and as the amount of live rock i have no idea, at least 200 lbs. if not more .i have a probe if that counts, wouldn't be without. that's about it not top of the line but it works for me.