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Old 05-01-2004, 09:07 AM   #1
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water temp

I have just set up a 30 gal tank with 2 maxi 1200 powerheads. My question is do the powerheads give off heat. My tank is at 84 and i have disconected the heater i can't seem to get the temp any lower. The room temp is only 70. I have a glass cover on the tank dos this keep in the heat? Any ideas ??

Thanks
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Old 05-01-2004, 10:53 AM   #2
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Powerheads give off very minimal heat because it uses the water to cool down the motor. 84 is around the temp of a natural coral reef so you should be okay if you can keep it stable.
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Old 05-01-2004, 12:51 PM   #3
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Take the glass cover off the tank. It will trap heat just like having your windows rolled up in the summer. Light energy goes thru the glass and converts it into heat but the heat cant excape.

The glass cover will also limit gas exchange and its important to have good gas exchange in a saltwater tank. It you cant take the glass cover off totally because your light fixture is sitting on top of it then look at just opening the front and taking the plastic part off the back. Increase the surface water movment by aiming your powerheads so they ripple the surface good.

Another thing you can do is use plastic eggcrate instead of the glass cover. This will help with the gas exchange, give you someplace to put the lights (dont use this directly to hold the lights if your using Powercompact or metal halide as it will melt the plastic), and keep the fish from jumping out.

If all else fails put some fans to blow over the top of the water surface when the lights are on. This will increase evaportaion and thus increase the cooling of the water.

I keep my tanks at or around 82F
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Old 05-01-2004, 03:00 PM   #4
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The light has a frame that keeps it about 2 inches off the water surface so i don't need anything to hold up the light . Do i need anything to keep the fish from jumping out. Where can i buy the plastic egg crate or do i really need it

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Old 05-01-2004, 03:06 PM   #5
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You can find the eggcrate at your hardware store in the lighting department. Its a white plastic light difuser that has 1" squares.

YOu dont have to use it but ti will aid in keeping the fish in should you have any 'jumpers'.
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