02-01-2009, 06:05 PM
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Whoa, do not get a heater thats too big. Once I bought a 200w heater for a 20 gal because it was only a dollar or 2 more than the 100w. A month later it stuck on and cooked my fish overnight. Fish stew. If it had been properly sized I would have had a lot longer to notice there was a problem. If you can afford it, using 2 smaller heaters is often recommended, if one malfunctions you will have longer to notice the problem.
3-5w per gallon is generally recommended. I saw a table somewhere, probably from one of the heater manufacturers, that said 200w should raise my 50g to 18degrees above room temp. I have had it up to 85degrees, so this is probably correct
Last edited by syrinx; 02-01-2009 at 06:19 PM..