I lost all of my acros except one. Most were 4-6". Top of a 37g so not a ton, but still disappointing.
All montis, lps, softies, everything else survived. Oh, and the xenia melted.
This was all with a 2 hour UPS that I only turned on to cycle the sump and the main tank every hour or two. The village's power came on the last in the entire city. I'm still not sure about the cause of that one.
This was a 37g with 12g sump, no leaks though!