Had a heater fail last night in my F-1 Viejita tank, temp was almost 100, male/female breeders dead, 12 fry dead. I just hope some of the fry I pulled will give me some females, I have some males from another batch but no females. It's amazing how just the littlest thing can become a game changer, if was one of the Hongsloi tanks it wouldn't be so bad as have more than enough of them to be able to recover, but not the Viejita's.