These are the fish that were loss when the circuits tripped in my house back in January. A lesson learned was pay attention to what type of circuit your tanks are on. This almost broke me to the point of getting out of the hobby.
So ur cicuits were over loaded and it tripped thus turning off everything>heaters, filters, sumps etc.
So sorry man, this happened to me last winter when i had 2 parrots (conures) and my heaters tripped the circuit, i came home to a 48° house with 2 parrots half frozen huddled together. Luckily they lived