You should have a heater in the tank (preferably 2 in case one fails) that stops the tank from sliding below 76 or so. I think that a lot of the people on here have been moving towards the titanium heaters because they don't have the breakage issue. It could sit in one of your sumps and keep the temp reasonable.
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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