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Old 08-27-2007, 12:38 AM   #1
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Partial Water Change Temperature

This may be a dumb question but I better ask anyway. I need to do a 15% partial water change in my 75gallon. However, the saltwater that I have been storing is about 4-degrees cooler than my tank water. Do I have to poor this water into a bucket and then get another heater to put in the bucket to bring the temperature up? Or is there a better way? The last time I did a water change which was also my first time, I was able to put the water container outside in the sun to heat it up. But I know I can't always do this, especially in a few months from now. Thanks.

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Old 08-27-2007, 12:41 AM   #2
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I personally wouldn't worry about 4 degrees, but you can add a heater and powerhead to your holding container (if possible) if it makes you feel better. That or the bucket/heater method you mentioned.

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Old 08-27-2007, 12:50 AM   #3
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When I add water to my tanks, I add it to the sump so it mixes before it enters the main tank. Fast temperature changes will damage the fishes swim bladder leaving the fish stuck on the bottom.
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Old 08-27-2007, 12:54 AM   #4
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I wouldn't worry about 4 degrees. But you will want to get a heater for the storage container for the coming months. Most likely, wherever your water is stored will be a lot cooler then and you won't have such a small temp difference between it and your tank. While you're at it, you probably want to throw a powerhead in there to, to keep the surface agitation/aeration going.
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Old 08-27-2007, 08:55 AM   #5
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I agree with the others. For the summer months a small 4 degree difference on 15% of the water is not much and in most cases is a way to lower the temp from warm summer time weather. As winter approaches and the water becomes much cooler you'd want to add a heater to warm it up prior to putting it into the tank.
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Old 08-27-2007, 04:30 PM   #6
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A few degrees isn't anything to worry about. However, it is worth mentioning that as the water temperature changes your SG reading can change with it (especialy if you're using a swing arm hydrometer). So it's always a good idea to bring your new water up to as close to the tank's temp before testing the SG to be sure it's as acurate as possible.
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Old 08-28-2007, 09:40 AM   #7
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I would like to clarify a 4 degrees difference is not bad for a larger tank with a smaller amount of PWC, like you are going to do. Personally, I have my premixed water sitting with a heater and ph.

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