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Old 06-21-2010, 09:35 PM   #1
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New t5 lighting and water temp question

I recently purchased a t5 54w x 2 light. The heat from this light has raised my water temp to about 83f-84f. Is there a way to lower my temp to 78f and keep it there without having to buy an expensive chiller?
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Old 06-21-2010, 09:50 PM   #2
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Does the light have actinics too? I had one on my 75 and it never heated the tank up. Also, is the light setting on the tank or on legs that put it above the tank?
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Old 06-21-2010, 11:07 PM   #3
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Run a fan across the top. This will lower the temp.
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Old 06-22-2010, 09:37 AM   #4
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A twin bubl T5 should not be putting out that much heat. Look for other causes, but as Mike said, running a fan across the top should help. I used to have mine on a timer that came on 30 minutes after my MH lights came on.
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Old 06-22-2010, 06:21 PM   #5
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Im positive that its the lights raising the temp. A day after I installed them the temp had risen. I do have them sitting on top of the glass canvas. Will the high temp hurt my fish? All I have in the tank is live rock, 2 clown fish, 1 koren angel, 1 yellow tang, 1 royal gramma, 6 mexican turbos, and 1 cleaner shrimp. No corals.
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Old 06-22-2010, 06:39 PM   #6
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If you have a piece of glass covering your tank then you just figured out your problem.

Remove the glass and replace with some eggcrate (if you are worried about jumping fish). Your pH likely will thank you as well! (Better 02 exchange)

Your fish likely would rather the tank be cooler, but shouldnt start dropping dead yet either although corals might start if it gets any warmer. Id suspect a negative impact on the fish soon if it gets any warmer.

Sounds like you have a greenhouse effect going on...
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Old 06-22-2010, 07:55 PM   #7
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Agreed. Get rid of the glass top.
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Old 06-22-2010, 10:27 PM   #8
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Can't really remove glass top. Have cats that like to get on top of the tank so egg crates won't work because their hair will fall right in. Would hanging the light about 6 inches above the tank with cooling fans help? With the glass top still in place.
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Old 06-22-2010, 10:49 PM   #9
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Dont worry about cat hair, it doesnt hurt anything. I believe there is a thread that recently addressed cat/dog hair and it was determined to be fine as long as they dont have some kind of chemical residue on them.

A power filter ought take care of any hair that makes its way in anyways...

Id be more concerned about that heat and a potential pH problem.
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Old 06-22-2010, 11:00 PM   #10
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I have eggcrate on my 180 as well as it's sump and 2 fuges. I have a 6 bulb t5 vho fixture and the temp stays at 78 deg. I have it on the stands so that may help, but I had more trouble out of salt creep when it was on my 75 just sitting on the tank than temp problems.

I know it wouldn't be perfect, but what about making a stilts for the glass top and raising it a couple inches above the tank. As the others have said, getting oxygen exchange is important.
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