thanks for all the great input. The reading where actual readings, but you are right i should go check to make sure the numbers match.
Keep the lights off longer or change out to LED lighting. The initial cost is hard but worth the reduction in $$ every month. Also, consider propeller style power heads over conventional impeller style ones. The "old school" power heads use way more power than the prop type(like Hydor Koralia). Same goes with HOBs, if you can swing one big canister vs two big HOBs, you will save money by virtue of eliminating a pump. I realize all these things dont use much electricity on their own, but combining them and running them for 24/7, and having these same equipment repeated over several set-ups, it can add up quick.
Curious, why do you have two 200w heaters for a 90g? 1 would be more than enough. Just curious.
Those 48" T5 and T8 HO bulbs are really going to be the biggest users though.
That sounds a little impossible to me, 2 weeks and the person used 400.00