My electric blues are pretty tough. The tempeture is around 75, I have been slacking on water changes, I had a broken filter for a few weeks, I feed live blackworms, mixed frozen foods, hakari pellets and they survived over a week in a blackout were the tempeture dropped to about 45 degrees. I set the tank up next to an outlet that is controlled by the light switch. I run an extention cord which always gets knocked out.