Originally Posted by flangers
Cheers bud, that's what was thinking but water changes help keep the balance, right?
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Yes, water changes help keep the balance. Yes, your Nitrates at 40 are a little high. Water changes will not make a big dent in your Nitrates until you find the source. Think of it this way...
Doing a 10% water change would reduce your Nitrates from 40 ppm
to 36 ppm
. Not much of a change. Then since you haven’t addressed the source of the climbing Nitrates it’s going to hit 40 again in a few days. Miss a water change and it keeps climbing to say 50 ppm
. Get the idea? You need to find the source of the Nitrate and eliminate it to really reduce it. One way to help is to keep Chaetomorpha growing in your sump. Cheato consumes Nitrates and along with water changes will reduce your Nitrates down to zero over time. Remember, even at zero you are producing Nitrates all the time.
By-the-way, a small amount of Nitrates are good for some animals such as clams.