how much water on change

[jamey73]

i am removing my cc in a 100 galloon tank how much water can i change?i am breaking down my tank to remove the cc and i want to do a water change at the same time.i am removing the cc because my nitrate levels are so high almost 60. thanks for any input.

 

[scopus tang]

What do you have in your tank for livestock, and how long has it been running. If you are breaking the system completely down you have some options on the water change, dependent on the above factors.

 

[al mc]

There is no limit to the amount of water change IF the pH, salinity, and temperature are the same as the existing DT water.

 

[garnet13aj]

I personally wouldn't do more than a 30% water change to begin with. It's certainly a good idea to get the nitrates down, but you don't want to lose beneficial bacteria in the proccess. I think it's better to do multiple small water changes than one big one. Maybe do 20% now, wait a few days and test the water and then change another 10%, keep doing this until your levels are down where you want them...There's no specific science to it, but this regime would be pretty easy on your system.

 

[al mc]

Originally Posted by garnet13aj
http:///forum/post/2506344
I personally wouldn't do more than a 30% water change to begin with. It's certainly a good idea to get the nitrates down, but you don't want to lose beneficial bacteria in the proccess. I think it's better to do multiple small water changes than one big one. Maybe do 20% now, wait a few days and test the water and then change another 10%, keep doing this until your levels are down where you want them...There's no specific science to it, but this regime would be pretty easy on your system.
There is minimal, if any, nitrifying bacteria in the water column. It is in the LR and LS. While the principle of small frequent water changes is Ok there is no reason that you can not change a larger amount (50% or more) at one time if you are doing it because you have 'polluted' water (very high nitrates, trites, ammonia, death of an organism that will release toxins..sea apple as an example). ...As long as the water changed is similar in other chemistry/parametrs as the water you are removing..pH, salinity and temperature.
Smaller water changes are usually in order to replace trace mineral loss in an otherwise normal reef system.

 

[nakadoc]

Originally Posted by Al Mc
http:///forum/post/2506419
There is minimal, if any, nitrifying bacteria in the water column. It is in the LR and LS. While the principle of small frequent water changes is Ok there is no reason that you can not change a larger amount (50% or more) at one time if you are doing it because you have 'polluted' water (very high nitrates, trites, ammonia, death of an organism that will release toxins..sea apple as an example). ...As long as the water changed is similar in other chemistry/parametrs as the water you are removing..pH, salinity and temperature.
Smaller water changes are usually in order to replace trace mineral loss in an otherwise normal reef system.
AGREE, I have seen first hand people change 80%+ in well stocked reef and not lose a thing. Your rock will help buffer as this is where almost all of your beneficial bacteria exsists. Your sandbed could be exhausted or it could be just a case of over stocking or over feeding? If you do small water changes your wasting your money as it will take you more water changes to get ideal parameters. Do some research and you will see

 

[jamey73]

thanks i think i will do a 30% change and see how it goes.