On Tue, 5 Mar 1996 15:39:02 -0500 you wrote: >So the tank is again without substrate heating. (oh well, it's >done fine without it for years) Karen, if you are up for experimentation, this might be a great time to try a heating element (like a heating pad or ????) under the tank. Since you are all set up for warm gravel anyway.... Dave Gomberg, Experimenta San Francisco CA USA gomberg at wcf_com