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Old 02-14-2013, 05:05 PM   #11
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That really isn't all that high. Fish and coral are more affected by huge swings or constant changes. Your MHs are like giant heaters so they are what is raising the temp. You can add a fan to blow across your dt or sump and should drop it by about 2 degrees. Your evaporation will go up though. If you can get it stable around 80 I wouldn't worry about it.
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Old 02-14-2013, 10:14 PM   #12
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i have both digital and glass thermometer. each on each end of the DT. they both show pretty much the same reading. I will try the fan idea. Day 5 and no heaters on in my sump or DT and temp is 82.2 during day and 80 during late night early morning
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Old 02-14-2013, 10:59 PM   #13
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Your sump pump might also be contributing the heat or power heads. I know my power head heats up my QT
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Old 02-14-2013, 11:08 PM   #14
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Anything that consumes power will dissipate heat for that matter specially motors or pumps.
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Old 02-17-2013, 09:20 PM   #15
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I have installed one fan on the metal halide stand blowing horizontally towards them. The fan is super loud. Annoying. it's been keeping temperature around the 80 mark but I have also noticed that my T5 actinic light stand is super hot. Both internal fans are working and clean but they're still hot.
I'm at a point I'm willing to buy a whole new light system that will do the job in my 90 gallon reef tank. I got polyps, mushrooms, anemone, clam, devil hands, kenya trees. what type of all in one lighting system would you recommend.
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Old 02-17-2013, 09:44 PM   #16
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You said even MH is off overnight and all heaters off you still get 80 deg temp in the morning. Replacing light will not solve your problem. It must be something else that is heating up your water. Do a process of elimination by switching off each circulation pump and power heads one at a time each night. You might also have a heater placed at the wrong spot where temp fluctuates a lot.
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Old 02-18-2013, 06:50 PM   #17
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can i turn off my return pump for 6 hours overnight to see if it's causing the high temperature? will it cause any distress to my DT and livestock?
I will also turn off each fan and power head, one each night of the week to see if it's any of them>
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Old 02-18-2013, 09:22 PM   #18
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Turning off the sump pump overnight should have a minimal effect on water parameter as long as you still have good water circulation in DT. The only problem is some corals like anemone are sensitive to sudden changes of parameter. It's hard to tell what might be causing the problem if one doesn't see the whole set up. A grounded pump can heat up without you knowing it. While a grounding probe prevents the bad effects on fish and corals it does not stop heating up the pumps. To be safe not to have temp go down too much, move 1 heater to DT mounted vertically with 75 setting and point one power head to the middle portion of heater.
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