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Old 01-16-2008, 06:08 PM   #11
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I agree with the stability and also agree 83 is not bad. What I don't understand is how a 65g tank is getting overheated by 130w pc lights. I run 350w (2x175) of MH for 8 hrs/day and 160w no flourescent (4x40) for 12 hrs/day and I have no problems with temp. PC's run way cooler than MH's. Something just doesn't seem right. Can it possibly be one of your pumps is running hot?

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Old 01-16-2008, 08:29 PM   #12
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Originally Posted by melosu58 View Post
You dont have a glass hood do you?

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Old 01-17-2008, 01:04 AM   #13
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Agree with cccapt... and that's why I was asking more questions.

I have 196W of PC lighting on my 46g, on for 10 hrs a day, WITH kind of a glass top (it's open somewhat for ventilation), and my tank temp doesn't vary more than 1.5 degrees this time of year. Low temp in the morning is 77.2 to 77.8 and the highest temp at lights off is 78.4 to 78.8. And I'm not even using a temp controller... just 2x 100W Visitherm Deluxe heaters.
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Old 01-17-2008, 01:08 PM   #14
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Having gone through this recently my solution was adding a fan time to come on 15 minutes after my MH lights come on and go off just after those lights do.

I also found that my titanium heater was off by 2+ degrees. I had a cheap plastic stick on (suction cup) thermometer that was reading a few degrees higher than the digital display of the heater. My digital BigTemp was broken and while waiting for its replacement I bought a lab grade thermometer. That agreed with my cheap plastic thermometer. Hard to beat a cheap calibrated thermometer.

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