02-25-2012, 11:03 PM
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You should get a thermometer. Well, 25 W is enough to rise like 9 Fahrenheit in 6 gallons. Since you can't set the temperature on such a small heater like that, it will. In your tank it could go upon 100 Fahrenheit, which is far more than deadly. I asked the temperature of your room, because it's not equal everyhere. On the top of an armoire it can be +2 or 3 Fahrenheits, or you also can put it close to the radiator. But use a thermometer for this, and forget about the 25 W heater.
But wait... If it's for mollies, get at least a 12 gallons tank for them.
Last edited by 4shi; 02-25-2012 at 11:07 PM..