Thank you guys for your good thoughts!! I went back home at aroung 7 pm and the power was back on, my little guy was hiding, with his head poking out as if it had never happened... I'll keep a close eye on him in the next few days for any signs of mucus, open mouth breathing, or anything suspicious... but I think he'll be fine. It was feeding day today but I decided to leave it for next week, my guy was probably too stressed out to eat anyway. And I didn't want to risk a bad digestion in case the power went off again... thanks for the support and the great ideas!