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Old 07-27-2012, 10:43 PM   #1
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Water change, too much or ok?

Is there such a thing as too much water out of tank? I know freshwater it really doesn't matter but I was curious about saltwater. Reason I'm asking is, I have the BC29 and a IM 8g. I get 10g of water premixed from a friend every Friday. I do a small water change in the little 8g which leaves me with about 9g left. I was only doing a 5g water change every week on my BC29 but now since I have the extra water I've been doing the 8g water change in the cube.

A friend told me to be careful because if I take too much of the water out I'm taking out nutrients and good stuff that it's the water? Doesn't really make sense. My uses instant ocean reef mix. So aren't I just putting back what I took out?

Sorry for the long dragged out post. In short is it ok to do that? Am I harming anything?
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Old 07-27-2012, 10:46 PM   #2
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That doesnt make any sence to me... If anything you are just re-adding all of the minerals and nutrients you took out so it doesnt really matter. My opinion is that it doesnt make a differance... I wonder what others will think...
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Old 07-27-2012, 10:49 PM   #3
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Originally Posted by Nu-Nu the eel
That doesnt make any sence to me... If anything you are just re-adding all of the minerals and nutrients you took out so it doesnt really matter. My opinion is that it doesnt make a differance... I wonder what others will think...
Yea didn't really make sense to me either he was like watch out! Don't take too much out. I figure it's a bigger water change and probably will benefit from it.
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Old 07-27-2012, 10:52 PM   #4
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Yes you can change too much, smaller pwc's more often are better than one large water change. Reefs, particularly smaller reefs need stability. Many things are different from your tank water and the new water, the temp is going to be slightly off, the salinity which will bel very close may be a hair off, the ph will be different, the alk, ca, mg, trace elements etc...are different. The larger the water change the more impact they will have on your tank and more stress on your inhabitants. And stress is a bad thing.

Edited to add, nothing good ever happens fast in a reef tank.
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Old 07-27-2012, 11:01 PM   #5
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Originally Posted by reefrunner69
Yes you can change too much, smaller pwc's more often are better than one large water change. Reefs, particularly smaller reefs need stability. Many things are different from your tank water and the new water, the temp is going to be slightly off, the salinity which will bel very close may be a hair off, the ph will be different, the alk, ca, mg, trace elements etc...are different. The larger the water change the more impact they will have on your tank and more stress on your inhabitants. And stress is a bad thing.

Edited to add, nothing good ever happens fast in a reef tank.
Hmmm... Interesting, thank you for your input. Would you say a 8 gallon weekly water change is too much for a BC29? I hate to waste the other 3-4 gallons. Rather use it if it won't cause an issue. But I do understand what your saying.
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Old 07-27-2012, 11:10 PM   #6
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Originally Posted by Convict2161

Hmmm... Interesting, thank you for your input. Would you say a 8 gallon weekly water change is too much for a BC29? I hate to waste the other 3-4 gallons. Rather use it if it won't cause an issue. But I do understand what your saying.
Assuming its a 29g tank, I think it's pushing the envelope. If you can get 10gallons...I would do a 1 gallon change on the 8 and a 3 gallon change on the 29 and save the rest for emergencies. Maybe every couple of weeks, skip getting it for a week.
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Old 07-27-2012, 11:48 PM   #7
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Thats absolutely not too much AT ALL. When people change tanks, they use ALL new water. That's completely different water, with no I'll affects at all. I personally don't think you can change too much water, If your parameters match up.
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Old 07-27-2012, 11:58 PM   #8
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I have 29 gal and I do a 5 gal water change. I do not think 8 is to much at all. JMO
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Old 07-28-2012, 12:05 AM   #9
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Personally, more water changed is almost always better IME. As long as the basics are matched, "turn over" is a good thing. The water in natural reefs is ALWAYS being changed by currents, tidal flows, etc.
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Old 07-28-2012, 12:07 AM   #10
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I was wondering the exact same thing.. I do weekly 8g changes on my 20, is that too much..?
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