Posted: Sun Jul 13, 2008 5:16 am :
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25 watt is sufficient for a 5 gallon..a few bucks cheaper and not so much heat at once.
When I bought mine, the smallest heater that they had was a 50 watt. I'm now glad that I bought it because during the winter, even with the bigger heater, I still have to turn it way past 78 degreees just to keep the tank at that temperature. Depending on the climate and the brand of heater a 25 watt might work too. Just what I found.