They are fancy goldfish, and have a heater in the winter time. I keep the tank at 76, but that was until recently. Before that, I kept it at 72 with no problems. The bristlenose actually breed quite frequently in the tank. In fact, I practically have baby BNs coming out of my ears!Caballero;4821965; said:Yes, I was referring to the terra-cotta. So bristlenose can cohabit with Gold Fish? I always thought of Gold Fish as being in a "Cold Water" set up...