I 2nd the generator. I lost power before 9am on Thursday night, and monitored my 3 tanks yesterday. Thankfully the temp was close enough to the tanks that I wasn't worried there, but O2
levels..... I started by just occasionally stirring the tanks as quick as I could do whip some O2
into it. Next was I took a 35ML syringe and sucked up mostly saltwater, and sprayed it into the tank, just above the water line, and it shot micro bubbles through the tank. Maybe not the best to get stuck on some of the coral, but I had to do something. At 6pm (21hours later) I broke down and asked a neighbor to borrow their generator. My line was the only one on my street out, tap fuse blew out. I'm glad I did, didn't get the power back until 2am this morning. All fish and coral seem to be doing well. I'd have saved myself a lot of stress and hassle if I had my own generator, which is on the list to buy before year end.