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I've had several 55 g over the years and have used anywhere from 100-200 watts with good results.
 

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I would go with a 250 watt, I have a 200 on my 50 gal and is not making the cut, tho It doesn't have a top on it either which should be taken into consideration I suppose, that and it always feel cold in here lol. I'd still say a 250 minimum is best.
 

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perhaps the heater is malfunctioning, I have a 200W jager that is really great on my 75 gallon.
My understand is 2-2.5 watts per gallon
 
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