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Old 11-04-2004, 09:20 PM   #1
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How much water change....

I have a 75 gal tank. I have water changes twice a month, I take out 14 gal. Is this O.K.
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Old 11-04-2004, 09:22 PM   #2
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Sounds like a good plan.
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Old 11-04-2004, 09:24 PM   #3
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I do 5 gallons once every..well, whenever. Why 14G? Thats about 20 percent. If its working for ya, great, but usually folks stick to 10 percent/week/month (7.5G out of a 75G tank), what ever. Is there a reason for doing so much? Algea issue, Cyano, just that bored?..
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Old 11-04-2004, 11:24 PM   #4
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I'm am a HUGE advocate of 20-25% bi-monthly water changes on reefs. I've found everything looks better, water quality is better, corals grow faster, and the water stays noticeably clearer allowing for better light penetration. IMO, anything less than atleast 15% just won't cut. Adacaro I think 14 gals. is perfect.
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Old 11-04-2004, 11:43 PM   #5
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Quote:
Originally Posted by MT79
I'm am a HUGE advocate of 20-25% bi-weekly water changes on reefs.

Bi-Weekly...did you mean bi-monthly?
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Old 11-05-2004, 12:14 AM   #6
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OOPS...Sorry, yes I meant bi-monthly. Thanks Luntiz.
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Old 11-05-2004, 12:56 AM   #7
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Works to about the same I think.

20% twice a month will reduce 100 units of something to 64 (100*.8*.8) units. (assuming no more produced)

10% four times a month will reduce 100 units of something to 65.6 (100*.9*.9*.9*.9) units

So I think either is fine.
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Old 11-05-2004, 07:15 PM   #8
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thanks to all
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Old 11-05-2004, 07:55 PM   #9
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I do 15 gallons every 2 weeks and my water levels are always dead on.
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Old 11-08-2004, 03:53 PM   #10
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When doing water changes on a setup with a sump/fuge, do you have to shut down the entire system, minus what's in display?
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