Ouch!

I have been guilty of almost the same thing... sometimes I feed my tank late at night, and with it being only 10g any flow at all blows the food off the corals, so I turn off the powerhead and the hob filter while everyone eats. Several times, I have gotten tired and gone to bed, forgetting to turn the equipment back on! So far, everything has been fine... the xenia would be rather droopy in the morning, but that was it. I see now that I should consider myself very lucky.

Sorry you lost your fish... that stinks.