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Old 02-07-2011, 03:44 PM   #1 
dragonfair
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50 watt adjustable heater in 5 gal tank?

Hi y'all. I know this has probably been talked about before (more than once) but I don't have time to search through the threads for the topic...

I have a 10 gal unfiltered tank and I want to downsize, but I sure don't want to buy another heater. Can a 50 watt heater work in a 5 gal unfiltered tank as long as I set the temp on the heater lower to work in a smaller space? Has anyone experienced this? Thanks!
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Old 02-07-2011, 04:44 PM   #2 
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Overkill. I wouldn't risk it. It may be able to stay on a low setting but if the thermostat breaks it will absolutely cook your tank.
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Old 02-07-2011, 06:03 PM   #3 
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I have a 10w marineland and it kicks me up to 84 all the time (uurrghh)!! Id say yeah- thats too much T-T
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Old 02-07-2011, 06:10 PM   #4 
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I am using a Tetra brand 50w pre-set type heater in one of my 5g unfiltered tanks without issue...keeps a stable 79-80F-but I also have a fairly cool house since I heat with a fireplace and my tanks are about 20ft from the heat source.
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Old 02-07-2011, 06:15 PM   #5 
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You definitely can use it!
I used to have one in my 2.5gal ou can but get a thermometer so you know EXACTLY what the temperature is and only add your fish once you get it to the right setting.
If the heater has a integrated thermometer, don't trust it! Mine sais 72 when the tank is actually at 80.
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Old 02-07-2011, 06:43 PM   #6 
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Good point Vilmarisv...very important to have independent heaters and thermometer....
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Old 02-07-2011, 08:54 PM   #7 
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Yeah, that's what I have - independent thermometers & heaters. I'm always monitoring them.

Hey, I just realized something - d'oh! I totally didn't think of this. I removed the filters from my 10 gal tanks, so I only fill them with about 6-7 gallons of water & I've been using the 50 watt heaters the whole time. My house is always at 65 degrees, so I have to keep the heaters set pretty high to keep the water temp at 79-80. Cool! This great - if I hadn't asked I wouldn't have realized I was already doing it. Yay! Thanks, y'all!
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