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Variance in water temp when doing water change

10 years 10 months ago #23729 by WhiteDevil
Just my observation with WC's and water temp here.

If you got breeders, usually 6-8 degrees COOLER sets them into a love frenzy, especially corydoras.

I have my tanks set at 80 and the water I put into the tank is 74-75 degrees. No ill effects, other then fry overload.

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11 years 4 months ago #20397 by whetfish
Yeah i do try to keep the temp close to the same but that just because I'm an...picky. 

I usually think about it terms of how much water I am putting in.  For example a 25% water change is going to mix with the water that's already in the tank.  As soon as the new water gets in the tank the temperature will imeadiately start moving towards the temp of the water in the tank.  So .75 tank water that's 78 degrees mixes with .25 water change at 73/83 degrees (5 degrees away) will give you less than a 5 degree overall temp change since there is more water that's 78 degrees.  The overall temp will probably change less than 2.5 degrees overall since there is three times as much water at 78 than 73/83(I don't know about that for sure since I don't know the real formula, but it makes sense in my head).  If you put some water in that's warm and some that's cooler (e.g. water from hose goes from warm to cool) I think would sorta cancel each other out for reasonable temps.  Again, I am not a hydrothermologist (probably non-existant) but logically this make sense to me.

Not checked for facts.

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11 years 4 months ago #20395 by
I wouldnt sweat it.  I usually start the refills at the mid 70's to high seventies.  It is usually ice cold by the time I am done

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11 years 4 months ago #20394 by bushynose
Thanks, Dragonkeeper. That'll save me just that much more time on my water changes.

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11 years 4 months ago #20370 by dragonkeeper
1/2 degree won't matter. Keep in with in 2 or 3 probably even 5 and your going to be fine.

Keeper

DragonKeeper
~Retired President~

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11 years 4 months ago #20360 by bushynose
I hope this is the right place to ask this question.  When I'm refilling my tank, what would be a safe range of new water temp? I hope I'm not too picky when I re-temp the water if it varies 1/2 degree from the tank temp.

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