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Old 11-08-2010, 11:38 AM   #11 
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Originally Posted by peaches3221 View Post
i'd say around 10-15 watts would be enough, as this 10 watt heater from petsmart says "for up to 3 gallons"
I have that same heater on my 5. Works awesome. Constant 78 the whole time.
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Old 10-20-2013, 08:08 AM   #12 
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I have a 10watt aqueon in my 3 gallon betta tank and it sucks! I want my temp to be between 26-28 degrees Celsius and this thing can only manage an average temp of 23 degrees celsius. Any suggestions?? I would def not recommend anyone buying this heater as it is useless.
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Old 10-21-2013, 10:25 PM   #13 
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25watt and 50watt will work fine for the 3 gallon. I have the hydor 50 watt in a Mr. Aqua 3 gallon bowfront no prob it's a 7inch heater so it will be fine very compact.
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Old 10-21-2013, 10:29 PM   #14 
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I was looking at a 50 watt aqueon in the fish store (they didn't have 25 watt). I have a 2 gallon and he recommended the 25 watt, said the 50 may be too much. I have no knowledge of this topic myself, only what he told me. I figure he was giving me his honest opinion because he had no 25 watts so he lost a sale.
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Old 10-22-2013, 02:13 AM   #15 
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I use a 25 w in a 3 gallon and it's great, but if you didn't want to take that one back I say try it on the lowest sitting preferably in another tank so you can monitor the temp without being worried about your betta. It might just work only keep it on a low setting. Idk though I've never used anything above 25 for that size tank.
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3 gallon, betta, heater

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