Hydor and I think ZooMed make mini-heaters of 7.5 watts. The Hydor is available on www.bigalsonline.com
. The ZooMed (or it could be Penn Plax) also sells one that I've seen at Petsmart.
That would be perfect for your 1 gallon tank.
I agree with the others about getting a heater. Its not about warmth, but about a stable temperature. It will flucuate because of the light schedule.
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