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i did 50% of water change


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  • SRC Supporter

hi guys,

did a 50% water cahnge yesterday and tested my no3

now range from 25-50.. initally was over 100ppm

i thought of doing another 50% of water change..my question is

how long do i have to wait to do another 50% of water change?

can i do it tomorrow?

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Reef Reefing Reefed

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Suggest you wait another week. Changing another 50% too soon will seriously stress your tank organisms. Nitrates don't build up that fast. You'll have to let your tank inhabitants slowly acclimatize to the new water conditions.

Always something more important than fish.

http://reefbuilders.com/2012/03/08/sps-pico-reef/

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  • SRC Member

simple reasoning:

First water change, gives you

50 ppm = 100/2

Second water change, gives you

25ppm = 50/2

Third water change, gives you

12.5ppm = 25/2

Fourth water change, gives you

6.25ppm = 12.5/2

Assumption: No additional NO3 add-in and build-up.

What is your targetted NO3 level?

Do you have enough salt mix ?

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  • SRC Member

precisely what I am getting at. To achieve a single digit by changing water:

50% require 4 changes (50, 25, 12.5, 6.3)

30% require 7 changes (70, 49, 34.3, 24, 16.8, 11.8, 8.2)

20% require 11 changes (80, 64, 51.2, 41, 32.8, 26.2, 21, 16.8, 13.4, 10.7, 8.6)

changing water is a necessary evil. Of course, it has all the benefits. And frequent water change is definitely recommended. But From the calculation above, this will also make the salt sellers very happy. <_<

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  • SRC Supporter

ya lor,always spend 60bucks per 50% change on salt..haiz.. i thought of getting nitrate reducer for long term run,anyway.. i will change it during this few days maybe on a tuesday :)

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Reef Reefing Reefed

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