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Old 02-26-2014, 10:41 AM   #1
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Water change

I have a 75 gallon tank with 40 Breeder sump. 0ammomia 0 nitrites and <10 nitrates. All testing done with api test kits. I have been doing 25 gallon changes once a week. This seems like a lot to me.... Am I right or wrong? Any suggestions?
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Old 02-26-2014, 10:45 AM   #2
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What is your goal? If it's to drive nitrates down, keep it up, reduce feeding and lighting if possible.

If it's a FOWLR tank, you should be OK with those params. You can try shifting to a smaller volume and see what happens. Taking into account displacement from rock/sand, you're probably at 25% a week, which is good.
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Old 02-26-2014, 10:50 AM   #3
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Your lighting will not affect nitrate. 25% is what I do in my systems. I also feed only 3x a week with 1 large feeding for coral and fish the night before my wc
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Old 02-26-2014, 11:05 AM   #4
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I'm just trying to see if what I'm doing is what I need to do or if I'm over killing it. I have 2 clowns and 2 cleaner shrimp and maybe 10 snails/blue leg hermits in total.
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Old 02-26-2014, 11:14 AM   #5
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No 25% is fine for weekly wc's
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Old 02-26-2014, 12:43 PM   #6
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Quote:
Originally Posted by Lloydxmas View Post
I'm just trying to see if what I'm doing is what I need to do or if I'm over killing it. I have 2 clowns and 2 cleaner shrimp and maybe 10 snails/blue leg hermits in total.
there is no overkill with water changes unless its over 50%, i have a 75g future reef with a 30g long refugium and i plan on 20g-30g water changes because you have to take into account your total volume not just tank volume, anywhere from 20%-30% is suitable every 2wks for your setup since its so lightly stocked i would go with 20% and just watch your parameters and keep your nitrates under 15ppm maximum
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Old 02-26-2014, 01:37 PM   #7
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I have a 75 with a 20L sump and have been doing 10g changes weekly and it has kept everything stable no3 is undetectable and po4 is always less than .10. I have API as well so every so often I bring a sample to the lfs to be sure. My issue seems to be keeping ph above 8 so I add buffer.
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Old 02-26-2014, 02:10 PM   #8
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Then should I be doing 25% changes every other week?
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Old 02-26-2014, 02:41 PM   #9
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Then should I be doing 25% changes every other week?
25% every 2 wks sounds good, i do a 30% every 2 weeks so 30g water changes for me, but if that doesnt dop your parameters low enough, you can switch to 20% weekly, it all depends on your system.
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Old 02-27-2014, 12:24 AM   #10
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I have a 75 with a wet dry sump so no more than 10 g there. I do a 30 gallon change every other week because that's what fits in my Brute. Nitrates always at or around 10 before the water change.
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