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Old 12-11-2010, 06:52 PM   #1 
CrankyFish84
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Can I put an adjustable heater that is 25 or 50W in a 2G?

Ok don't yell at me lol I know it says 5W per gallon, but if it is adjustable and shuts off when
the set temp is reached, how could it overheat a smaller tank?
I ask because my heating pads & tetra presets are not working well in the hopsital tanks (2G and a 3G).....They are only making it 74 (room temp is 66). The tanks are acrylic.
Can I use my spare higher wattage heaters instead?? I don't want to bake them alive though...
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Old 12-11-2010, 08:08 PM   #2 
kfish
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You can always test it out with a thermometer first. Let the heater run all day in 2 gallons without fish and see if it maintains a good temperature.
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Old 12-11-2010, 08:14 PM   #3 
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Yeah I will do that w/ an empty KK tonight, and just keep the tetra preset ones in the hospital tanks till I see if it gets too hot. I'll cover the fish w/ towels too since it's going to get colder
tonight (well, for FL that is..lol). Burrrr...!
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Old 12-11-2010, 08:34 PM   #4 
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I have a 25w in my 2.5 gallon tank and it works well for me. Even though I live in Hawaii where it is usually in the 80's (70s to even 60s in winter) It doesn't over heat my tank. I vote go for it! You should probably use the 25w, not the 50w.
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Old 12-11-2010, 09:40 PM   #5 
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I had a 25 watt non adjustable heater in 2 1 gallon tanks and it was fine. I had no problems. Now I'm using one in my 10 gallon tank.
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Old 12-11-2010, 11:28 PM   #6 
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I have a Tetra 50W nonadjustable with a thermostat in my 2 gallon bowl. Keeps the water between 70-78. Neptune doesn't seem to mind the fluctuation so I am not too worried.
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Old 12-12-2010, 09:34 AM   #7 
Lion Mom
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I use a 25 watt adjustable, submersible heater in a 2 gal. glass bowl - keeps the temp at a steady 78.
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Old 12-12-2010, 10:22 AM   #8 
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The verdict is in from last night's test....Both Hydor 25W and 50W adjustable heaters, in 2G acrylic keepers, will maintain temp within +1 of what you set it to. So that also means my Eclipse 3 light really is to blame for the temp going so much higher than the setting, in the one I have a 25W in.
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Old 12-12-2010, 10:44 PM   #9 
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I have a 25 watt Marineland stealth visitherm in a 2.5 gallon tank and I have had no problems.
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Old 12-13-2010, 10:52 AM   #10 
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Yeah, those lights can really affect the temp. I like LED or florescent lights. I use Hydor(?) 25 watt adjustable heaters in my 3 gal tanks and they work fine... except I have to keep them set at 88-89 to keep the water temp from dropping below 78 degrees (I keep my house very cool). But my 50 watt heaters in my 10 gal tanks keep the water perfectly at the set temp.
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