Water a lil warm - The Planted Tank Forum
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post #1 of 3 (permalink) Old 03-22-2009, 06:57 AM Thread Starter
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Water a lil warm

i recently got glass top covers for my 90 gallon tank and i notice my water temp has increase to 82 deg... up from 78 deg , is there way i can get the temp back down???
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post #2 of 3 (permalink) Old 03-22-2009, 07:00 AM
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Remove the glass top. Or prop up one edge to allow for evaporative cooling. Or a chiller.
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post #3 of 3 (permalink) Old 03-22-2009, 07:37 AM
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I'll bet your light fixture is heating up the glass and then trapping hot air between the glass and the water, heating the water. Does the glass cover the entire top? Most lights other than standard fluorescent are pretty hot to run directly on the glass. I would strongly recommend using eggcrate instead of the glass (see the picture on the hyperlink below- it is very commonly used on reef tanks). It is specifically designed for placement below a light so it can tolerate high temperatures and better diffuse heat while still allowing light to pass through. You can find it at most hardware stores (I bought some at Lowes for $11.99 and it is 3' x 5' in size), and you can cut it to whatever shape you want using wire cutters or even sturdy scissors. I have it over my tank in such a way that it goes under the light fixture and rests on the rim of the tank on the left and right just as a glass hood would. I then left the back open for the heater and filter, and the front open for access. If you are worried about fish jumping, you could probably use a peice of your glass cover to provide access to the tank without having to remove the eggcrate. Just cut the eggcrate to cover the equiptment tightly and then leave the front open and use the glass access from the glass cover (assuming you have a glass cover and not just a peice of glass). That's what I would do anyway because you don't want cooked fish!

Eggcrate: http://www.kiddailey.org/aquaria/upy...n/eggcrate.jpg
On a tank: http://seanmcg.com/blog/wp-content/images/IMG_6578.jpg
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