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Old 03-23-2007, 10:09 PM   #1
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Lighting Heating Water

I turned my lights on and within three hours the temp. went from 74.4 to 76.5 how am i going to stop this rapid change in temp when i turn the lights on?
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Old 03-23-2007, 10:11 PM   #2
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clip on fan, but why is your temp 74 to begin with?
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Old 03-23-2007, 10:16 PM   #3
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i dont know, i thought it was a good number to have .....no live things in my aquarium...*shrug* where do u get a fan small enough to clip onto an aquarium?
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Old 03-23-2007, 10:18 PM   #4
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Ah...I thought you had a tank running. I wouldnt worry about 76deg, but you should raise it to 77-78ish when you have livestock. If you want a fan you can get em at walmart.
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Old 03-23-2007, 10:19 PM   #5
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I use a floor fan that blows across the surface (for my 125G). What kind of lid do you have?
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Old 03-23-2007, 11:43 PM   #6
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right now its topless, i kinda want to keep it this way if possible, but if its a big deal i could make a cover pretty easily. then i could have a fan blowing air at one end and out the other!
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Old 03-24-2007, 02:56 AM   #7
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If you've got a temp problem, you don't want a lid. I think that's why Roka was asking... probably assumed like me that you had a tight glass lid that wasn't letting any water evaporate off and cool things down. Sounds like if you just add a little clip on fan, you'll be OK.

I have to admit though... a 2 degree swing for 260W on a 55g seems like more than I'd expect. I've got 200W on a 46g, and only see a 1 degree bump or so. What size heaters do you have and how many? Sometimes if you don't have your heaters placed well, or have two of them that are set at different temps and can't tell if they're on or not - this will create temp swings in itself. Did the tank hold a pretty constant temperature before you set up the lights? Just wondering out loud if it could be something other than your lights causing the drift.
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Old 03-24-2007, 08:54 AM   #8
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Quote:
Originally Posted by pph_2ppr
right now its topless, i kinda want to keep it this way if possible, but if its a big deal i could make a cover pretty easily. then i could have a fan blowing air at one end and out the other!
Dont cover your tank with a glass top. It will lead to low PH readings due to poor gas exchange at the surface. And as Kurt said it will heat up your tank even more and cause wild temp swings. Also my tank stays at 74-75 all yr long. Temps can be anywhere from 72-84 but stability is the key. Keeping it at the same temp all the time. I definitely agree with the clip on fan.
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Old 03-24-2007, 12:10 PM   #9
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I agree, covering the top can cause a low pH and extra heat.
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Old 03-24-2007, 04:10 PM   #10
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I recommend bumping the temp up at night to about where the lights keep it during the day. There is much less flucutaion this way, and you will not increase evaporation which causes SG swings. 78-82 degrees is fine, stablility is most important. FWIW I use MH, and many people w/ them including myself run 82-84+ in the warmer months with no issues.
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