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Old 09-20-2006, 12:07 PM   #1
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How temperature affects your aquarium

I had a problem with 'ich' a few months back and lost a number of fish. I talked to another guy about it and he said that it's most likely caused by water temperature fluctuations. At the time, I had also introduced some new tankmates. It could have been that also...I dunno. My question is - has anyone else had any experience with this? My water temp is 78 when I wake up in the morning, then after the lights have been on for a few hours, the temp climbs to 80 degrees and stays there for the rest of the day. Can this be the culprit?!?

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Old 09-20-2006, 12:18 PM   #2
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I've had this happen in my freshwater tanks before. Temperature changes can cause ich if it is a large change in temperature over a short period of time because it stresses the fish and makes them more likely to become infected. When it happened to me the temperature swayed from about 74 in the morning to about 82 in the afternoon (it was the summer and the tank was a 10 gal too close to the window). So I fixed it and the temp usually goes from 78 to about 82 in the summer everyday but the fish are use to it.

Remember in the wild the same thing happens where the water is cooler at night and in the morning than compared to midday and afternoon. A 2 degree change is fine and I don't think you can really do anything to stop it from happening.
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Old 09-20-2006, 12:23 PM   #3
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Thanks for the reply. It hadn't happened before and I've had my tank up for over a year so I think i can safely blame it on the stress of the new arrivals then. I was thinking of building a hood to get the lights off the top of the aquarium and adding a couple of computer fans to get the heat out but if a 2 degree fluctuation isn't too bad then I'll scrap that idea.
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Old 09-20-2006, 12:28 PM   #4
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Yea it was the new arrivals. I've had my freshwater running for four years and all of my ich problems where within the first couple of months, well it happened one more time later but it didn't kill anything.

Yea that would be a lot of work and $ to fix something and doesn't need to be fixed.
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Old 09-20-2006, 12:34 PM   #5
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One thing you can do is set your heater to the temp that the tank reaches at its most hottest point of the day. Then, when the lights go off, the heater will do its job and keep the temperature stable.
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Old 09-20-2006, 01:10 PM   #6
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I thought of that but now I'm wondering that if I do that, i'll start at 80 and then when the lights come on, won't it raise the temp up again? I feel like I'm overthinking it. LOL!! Also, I had a number of SPS corals in the tank which perished in the heat of the summer last year. I really don't want to pay a fortune for a chiller. Has anyone been able to keep the water temp down by other means? I'd love to replace my sps corals but it would be dumb unless I can keep my water temp steady. I have heard that putting a fan on the sump helps keep the water temp steady as well. Any thoughts on that?
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Old 09-20-2006, 02:04 PM   #7
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You can use a fan over the sump or blowing over the top of your tank.
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Old 09-21-2006, 10:11 AM   #8
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A fan will solve most all your porblems!
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Old 09-21-2006, 12:49 PM   #9
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I personally dont think a 2 degree swing will hurt your tank. What happens is your if your tank already has the parasite in it then you have big temp changes then the fish will be stressed out lowering its immune system and then the parasite attacks. I dont see where heat is the factor here. But yes a fan across the top will help lower temp a few degrees
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Old 09-21-2006, 02:14 PM   #10
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I had a pretty major temperature increase for a sustained period of time when the corals died. That was not at the same time that the fish died. The water temp increased and killed the corals due to a really hot house - no air conditioning - over the hottest period of the summer last year. Or, at least that's what I think killed them.
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