I came home for a few days to visit my parents, and instead of transporting 3 tanks, i have 2 one gallon kritter keepers and a 3 gallon kritter keeper. Well I brought their heaters and everything, and set them up. I lowered the settings on the two heaters going into the 1 gallon so i didn't have crisp fishies. My parents house is pretty cold so i figured i could still use the heater specified for 5.5 gallons or less. I went for some reason to check my fishies, two were hovering around 70, not completely horrible. But one heater apparently didn't plug in right and poor Cornelius(Edit: Arthur) was around 55 degrees. He has lost all his color, he is like a muddy brown, normally a blue pink and purple. I am trying to bring the temp back up but I feel bad for him being a betta popsicle. :( Hopefully he survives this ordeal