Mine have always started right back up and they have been running on these tanks for more then four years now. They started back up with no problems even when I was on vacation in the Carribean Islands last year. I had someone coming in to check on my bird and all of my tanks. I am so comfortable with them starting that if we have a power outage in the middle of the night, I rarely get up to check these filters to see if they are back up and running properly. They have to date been fine.My AC on the other hand is another story. When I was on vacation it did not kick back on and I had to tell my person checking on things what to do to get the AC going again. Go figure!
Marinemom