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4 watts per gallon 24/7 365 a year, cuz the house gets cold at night with the AC and this keeps the critters warm. You'll need a heater to warm your water change water before you put it in your systems. I like EJ's, I have one that is 8 years old. I would suggest that you buy the smaller ones to get several to make up your 4 watts per gallon, that way if one DOES stick in the on position, it will take a while to do any damage to your system, and if one goes out, the others will carry th load (for a surprisingly long time...) For example, in the 180 I have 4 x 200 watt heaters (include your sump volume), all located in the sump.
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Tom <"))))>(
(TDWyatt)
Wise men speak because they have something to say; fools, because they have to say something. -Plato
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