advice on choosing heater wattage for 300g + sump

  • We are currently upgrading MFK. thanks! -neo
Multiple heaters running on a controller/thermostat are the way to go IMO. And on this topic, if your tank is going to be in a cold garage seriously consider insulating the back, sides and top with polystyrene. Here is a calculator made up by a guy on our local forum where you can work out how effective the insulation will be and how much power you can save; http://www.fnzas.org.nz/fishroom/viewtopic.php?f=3&t=48031
 
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