I keep my cories in a tank that stays around 70 f., and some have lived to 13 years. The peppered and bronze ones have been the longest lived for me. I have kept peppered, bronze (both brown and albino), julii, bandit, and I just recently added 8 pandas. This is the first time I have kept pandas. I have had the peppered cories breed, and it was when we were away and the thermostat was turned down, so you are right, JJ09, cooler water seems best for breeding. Cories are such great little fish!