Ok Thank you all. If the heaters run 10 hours that will cost me 30.00
per month... 1000 watts per hour is 1 kilowatt times 10 cents per
kilowatt. hmmmm Can they survive at 68? Im not trying to waist
electricity. But if it ran 24/7 it would be 2.40 a day. That can add up
quick. How warm do most ponds get in the summer (on average) I never
used to check the temp with goldfish. But will they get hurt if the temp
goes to 68? Or is there a cutoff temp to avoid. Thanks all for comments