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Old 01-09-2004, 04:10 AM   #1
jread
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Did a 20% water change on my currently cycling 10-gallon today, and noticed something alarming:

On my reef tanks, I always had a jug of pre-mixed water as well as a jug of R/O water for water changes/top off. These jugs were at room temp. because they just sat there until I needed them. Whenever I did water changes, I never had to worry about the temp dropping too much.

Today I did a water change on my freshwater tank and used tap water. I didn't think about this, but the temp of the tap water is MUCH colder than the tank temp (especially with it being winter). After the water change, my tank temperature instantly dropped about 5 degrees!! Thankfully there are no fish in the tank right now!! That could have been bad!

My question is this: since I only have one jug for siphoning/filling my tank, should I turn on a little of the warm water when doing water changes? I know I shouldn't make it *warm* but at least not freezing cold like it is right now. It seemed like this would be the logical solution, but I wanted to make sure that using water that has been heated would not harm them in any way.

Will this work? What do you do on your tanks to keep from shocking the fish with a drastic temp. change?
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Old 01-09-2004, 04:23 AM   #2
mario
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Just get yourself a thermometer and add warm water to your jug until it has about the same temperature as your tank. After a while you won't even need the thermometer anymore, and you can judge the water temperature with your hand. On top of that, most fish can easily deal with a temperature change of a few degrees every now and then.
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Old 01-09-2004, 04:25 AM   #3
2la
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Hmm, it seems to me that the most logical thing to do is get the temperature of the tap water roughly the same as the tank temperature. Does your faucet not have a hot water handle that allows you to adjust the temperature?
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Old 01-09-2004, 04:32 AM   #4
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I just get the water warm (80ish) out of the tap... I err on the high side because I think it's less of a shock. I used to worry about gunk/minerals from the water heater, but haven't had any problems...
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Old 01-09-2004, 04:32 AM   #5
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Quote:
Originally Posted by 2la
Hmm, it seems to me that the most logical thing to do is get the temperature of the tap water roughly the same as the tank temperature. Does your faucet not have a hot water handle that allows you to adjust the temperature?
Yes, I do have hot water.. lol. I know, it seems like a dumb question. I just wanted to make sure that the heated water is ok for them, meaning that the way it's heated in the hot water tank doesn't change the composition of it in a negative way. Chemistry is not my strong point, obviously
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Old 01-09-2004, 04:33 AM   #6
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Quote:
Originally Posted by hypsophrys
I used to worry about gunk/minerals from the water heater, but haven't had any problems...
That's what I was asking about. I guess I should have worded it better.
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Old 01-09-2004, 04:33 AM   #7
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Looks like we were typing at the same time. :-)
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Old 01-17-2004, 05:42 AM   #8
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Quote:
Hmm, it seems to me that the most logical thing to do is get the temperature of the tap water roughly the same as the tank temperature. Does your faucet not have a hot water handle that allows you to adjust the temperature?
This is what I do and I've never had a problem.
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