jezzeapi, Glad to hear that your jaguar cichlid made it. I hope you got your dad a good Xmas/holiday present.
BTW How big is your managuensis? Must be one big mean fish.
My catfish, also in a 125 gallon tank, barely survived. I tried warming up water with sterno, a ultra slow and long process, and I eventually ran out of sterno. The tank got down to 61 deg after 5 days. I wish I knew about scytale's trick earlier.