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RafflesGold Forums > Discussion Area > Green Water, Filtration and Tank Setup
lnicky
I used my Nitrat test kit for the 1st time in months. The reading says it's 40 mg/l which is very high

Nitrit is 0 mg/l and PH is 7.8. I do 20L WC almost everyday in a 180L tank (4 ranchus).

In addition I used 3 filters: 1 large cannister filter, 1 sponge filter and I pour the water outflow from the cannister into a basket of bio-balls on top of the tank.

I always checked the Nintrit level so I wasn't too worried until now. Can the bros please enlighten me what I did wrong with my water management? how can I reduce the Nitrat?

Nicky
CP
Nitrates at 40ppm is still OK, I usually cap it at about 50ppm.Another good thing is that zero nitrite indicates that your tank is cycled.

To reduce your nitrates, you need to do massive water changes.In your case, changing 20L daily does not dilute the nitrates much thats why the level remains high.

Changing 20L every day IS NOT the same as changing 40L every two days and IS NOT the same as changing 60L every three days etc.

Changing 50% water every week IS NOT the same as changing 100% every two weeks etc.

It is better to change 100% every week as compared to 50% twice a week.It all boils down to nitrates dilution, which is linear, and here is a very good mathematical explanation:
http://www.goldfishconnection.com/articles...&parentId=8
Occellatus
Besides water changes, another way to reduce nitrates is to install a denitrator.
CnT
QUOTE(Occellatus @ Tue, 25 Dec 2007 6:10 pm) *

Besides water changes, another way to reduce nitrates is to install a denitrator.


Can u kindly explain wat tis is n how it works? a pic would be nice too.

Thanks peace.gif
lnicky
I read somewhere that high nitrate could cause goldfish to float. Do you guys know why???


Thanks
CyberET
it affects the fish's ability to breath properly
Occellatus
QUOTE(CnT @ Wed, 26 Dec 2007 10:40 am) *

Can u kindly explain wat tis is n how it works? a pic would be nice too.

Thanks peace.gif


A denitrator is basically a device using nitrifying bacteria under anaerobic (i.e. without oxygen) conditions to remove nitrates. This process is called biological denitrification.

Its available commercially, but price is expensive. You can DIY one too. Do a google and u will find lots of info on denitrators and how to DIY em.

I always wanna DIY one myself....got the sketch ready....but just dont have the time to do it up. sad.gif
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