I know for a fact that rosy barbs can survive 2 deg celsius, so I'm going to try an experiment, I know winter is a while away but I am going to keep a raphael or pictus, probably a pictus, in my bog filter to see how long he'll last. The water can get to maybe 0 celsius here so if it survives, I might try some bigger south american catfish like a tsn or cheaper big cats, a jack dempsey I had and thought died in some rocks and got eaten by the other fish survived some temps in the 40s and 50s for 30+ days

