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Old 05-22-2009, 09:18 PM   #1
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Unhappy Heater broke???

Hi all!
I have a 55 gallon tank and am concerned with the temperature. I purchased a 300W Hydor heater. Right now I only have 4 neon tetras (10 have died - I believe - because of the heater) and 1 glo-fish. Earlier this week, we go to feed the fish and the tank is @ 85-F!! We turn the heater off, turn the lights off and start trying to oxygenate the tank by pouring tank water from about 1-2 feet above tank. The neons start dying. We wait for the temp to drop and turn on the heater to try to be around 78 but it drops to 75. We turn it up and it goes up to 85 again! Now it's at 76 and the heater is set to 79. I'm trying to figure out if the heater is broken. We see the light turning on and off BUT after changing the temp on the knob...it takes a while before anything happens. I keep reading that you should check it in a couple of hours so I'm expecting a change and nothing happens. How long should it take for the temp to change after moving the temp knob? Do I need to invest in a power head to move the water around??
Any help/suggestions would be greatly appreciated.
Thanks!
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Old 05-22-2009, 09:22 PM   #2
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first off, that is to big for your tank.. especially with your live stock. just invest in a 150w heater and you should be fine. where is your heater located? next to the filter intake? opposite side? it all plays a roll. but yeah id look into a new heater.

btw.. what is probably killing the fish is the constant water temperature changes. let it stay at 85 if thats where it can keep a constant temperature at. its not THAT BAD for the fish..
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Old 05-22-2009, 09:24 PM   #3
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btw.. a 300 watt heater is good for a 90-125 gallon tank.. WAY to big for your tank imo
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Old 05-22-2009, 09:26 PM   #4
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Quote:
Originally Posted by MichaelsLilGray View Post
btw.. a 300 watt heater is good for a 90-125 gallon tank.. WAY to big for your tank imo
Well, we bought it based on the info on the box. It read that it was for 53-80 gallons? Could it be that each heater is different?
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Old 05-22-2009, 09:32 PM   #5
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last i checked thats not the case..

Aquarium Heaters: Visi-Therm Stealth Heater
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Old 05-22-2009, 09:41 PM   #6
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Not to argue but the hydor seems to be different...maybe b/c of the patented heating film...not sure but take a look.

Aquarium Heaters: Hydor Theo Heater

thanks.
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Old 05-22-2009, 10:13 PM   #7
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The heater size isn't a problem. It is recommended to aim for 5 W per gal.

Don't go by the temp on the heater, go by the thermometer in the tank. Was the tank cycled before adding the fish?
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Old 05-22-2009, 10:52 PM   #8
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5 watts per gallon would be a 250.. my 150 in my 55 works great... and my 125 has a 150... that keeps the entire tank the same temp.. and has done so for months... one fresh the other saltwater.
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Old 05-22-2009, 10:56 PM   #9
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The tank is 55 gal, 275 W. The ambient room temp also plays a big role. If you keep your house on the warmer side you won't need as big of a heater. If the heater is heating too high, turn the gauge down and it won't heat as often.
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Old 05-22-2009, 10:57 PM   #10
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my house is set to 70 degrees lol
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