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Originally Posted by Tony G. yes... i have a 100watt in my 35g and its set at 84 and it keeps it at 78 which is great. IMO its better to be underheated than the appropriate heater since you never know if it is faulty and nukes the whole tank... |
I'm going to have to disagree. Using a heater that is not powerful enough for your tank is asking for trouble. For starters, it'll ALWAYS be on because it's not powerful enough to reach the desired temp. Setting the temp at 84 to get 78 is a prime example of this. If you don't pay for you own electric bill, this is nothing to worry about. Another concern is burning the fish because the heater is soooo overworked. Also, the heater is more likely to malfunction and break because it's doing a job it was not built to handle.
It is far better to have a heater that is more powerful than you need. There extra power means the heaters wll take less time to heat the water, meaning it'll only come on here and there. This is MUCH better than having it run continuously. Also, you'll be able to PRECISELY set your tank temp.
Ratliff - get a second heater and run both, or pony up and get a heater rated for 75 gallons