I ended up getting a tetra submersible heater for 2-15 gallons. My thermometer says my tank temperature is 66 degrees, freezing I know. The heater is supposed to automatically shut off at 78 degrees but will shut itself off at 70-72. I have called the customer support and am receiving a new heater by mail in a week or so. I am just wondering, is there something I am doing wrong? I've had the heater vertical, horizontal, half way; but it won't heat past 72 degrees. It's non-adjustable.
Last edited by Missbean; 02-18-2013 at 04:29 PM.
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