GF are NOT cold water fish. They actually thrive at 75-78oF. they can do well at
lower temps but what is really important is steady temps. with a 5 gallon tank the
temp would swing too wildly for good fish health. get a bigger tank and do get a
heater, like a 50 watt. dont get too big a heater for the tank because when the
heaters break if they are large enough they can so heat the water that it kills the
fish. Ingrid
http://weloveteaching.com/puregold/

On Sun, 17 Feb 2008 13:21:29 -0500, (L u) wrote:

Is it true that goldfish don't need a heater? I don't have one.

Lu