Today I bought a bronze shubunkin as company for my only goldfish (the sole survivor of a group that lived in my pond for a period of time that I am not sure of; currently living in a tank). From what I can see, the shubunkin is not doing very well; it is not moving very quickly and is constantly facing upwards. I have a feeling that this is because the water in the tank is too cold. Should I raise the temperature of the water in the tank, or not? If so, what should the temperature be? Thanks in advance.