None for me. Outages here are usually short on offs. Breakers and switches in the system quickly fix them. Way too frequent for where we live in the middle of a city. Maintenance issues I’m sure being a retired lineman on the communications side but well familiar with their system. Tree trimming isn’t as often as it use to be. Our last home never had an outage unless planned for maintenance. This regime of the big conversations years ago about solar. People spending $60,000-$80,000 on systems thinking they got bargains and how they lowered their bills while somehow taking a second on their homes.
I believe if you have a simple system the thoughts(worries) are lower on the expectations list. People say they have battery powered air pumps for oxygen reasons. Should have an internal air Venturi skimmer to go with it. My thoughts are these these fish for most parts are shipped from around the world in bags for hours and days, they be fine for a time in an adequate aquarium. Just make sure you have equipment that restarts without issues and your system can self contain itself.
I’m going to start a new post to coincide with this one. Look for it.