please help...trying to lower nitrates

[cancun]

Hi everyone.....I have a 29 gallon Biocube....been set up and running for several months....but can't seem to get my nitrates lower than 20 ppm....my ammonia is 0....nitrites are 0....salinity is 1.024....ph is 8.0....my nitraits fluctuate between 20 ppm and 40 ppm....I test both with API liquid salt water test kit and API test strips...I have been doing 10% water chg once a week...was doing wc evrry other week...just started every week trying to lower nitrates. ...have biocube 29 gallon protein skimmer...biocube filter....also using API chem-zorb under my filter in the back chamber.....I have 30-40 lbs of live rock....live sand....my bio load is:

Clownfish

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Coral beauty
6 line wrasse
Watchman goby
Small sea urchin
Choco chip star fish
Green bubble tip anemone
Coral banded shrimp
Few small snails

I feed a small amount of Rods frozen food once a day...and spot feed the anenome twice a week.....everything is thriving and doing great...see pics...any suggestions or ideas would ne greatly appreciated!! Thank you!!!

 

[carey]

Just answered your other thread.

You can post it just once and people will find it.