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Old 12-31-2010, 05:59 PM   #1
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VHO lighting heats up water?

Just like all my other threads...... Starting up my 65g with (4) 24" VHO lights. When the lights are off the tank is staying at stable 77 degrees. I started doing the light cycle to make sure the water temp would still be the same. Well it actually climbs quite a bit! During the day it's hitting 80-81. Heaters are off. Is this normal?! I was reading that people's water temps usually stay within one degree throughout the day?

Anything I can do? It does have a canopy and the back of the canopy is open. Wonder if I just need some circulation? The tank has NOTHING in it yet. Just mixed water being heated up awaiting live rock and sand.

Should I be shooting for 77-78 degrees as constantly as I can? What's the sweet spot?
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Old 12-31-2010, 06:07 PM   #2
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Going from 77 to 80/81 is not that big of a change and I wouldn't really worry about it. If you can, mount a small fan in the back of the canopy to move the air around. That should help move out the heat generated by the lights.
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Old 12-31-2010, 06:11 PM   #3
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I thought 80-81 was pretty hot? What's a max temp you would be comfortable with? What temp do you shoot for?
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Old 12-31-2010, 06:27 PM   #4
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I try to shoot for 78,even my tank gets up to 80.5 & 81.
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Old 12-31-2010, 06:32 PM   #5
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Mine goes from 78 in the morning to 80 in the evening. As Larry said it`s not that much.
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Old 01-01-2011, 08:42 AM   #6
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Ok thanks everyone! Just being overly cautious I guess. I have it closer now. This morning after cooling through the night it's at 78. Going to keep an eye on it today and make sure it doesn't go over 80.
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Old 01-01-2011, 09:45 AM   #7
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Quote:
Originally Posted by NickRummy View Post
I thought 80-81 was pretty hot? What's a max temp you would be comfortable with? What temp do you shoot for?
This article has some great info.
Reef Aquarium Water Parameters by Randy Holmes-Farley - Reefkeeping.com
Reef Aquaria Recommendation
Temperature - 76-83° F
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Old 01-01-2011, 09:53 AM   #8
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i would adjust the heaters to 80.
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Old 01-01-2011, 11:17 AM   #9
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Quote:
Originally Posted by ccCapt View Post
This article has some great info.
Reef Aquarium Water Parameters by Randy Holmes-Farley - Reefkeeping.com
Reef Aquaria Recommendation
Temperature - 76-83° F
Lots of great information in that write up! Thanks!
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Old 01-01-2011, 01:21 PM   #10
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I keep my tank at 79 (mercury -- 81 digital). It used to vary by 2 degrees even with a fan blowing across the top when I had MH lighting.
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