Northern California power outage

Wanted to work on the tank but Northern California storms led to power so no garage time. My little killies were waiting in the 20L house tank and it was getting cold. By the time I got home from work it was 60degF (down from 76). We didn't know when the power was scheduled to come back on so I drained the tank down and moved it to another house (relatives) that was not affected by the outage. Luckily only a few minutes drive away. This morning they're happy, and slowly heated back up to 72ish at this time.