Urgent help with my plants!

Ommicaqui

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Joined
23 Jan 2020
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Location
Dominican Republic
Hello guys!

All my plants seems to have nitrogen defficiency but my api test show nitrates at 40 ppm - 80 ppm if i dont make water change.

i have 6 hour of ligth. High ligth with a twinstar 600EA. Co2 is on 2 hours before ligths and turn off at same time of ligth, always hitting a dark green on the co2 indicator.

the planta shows new leaves good and green, but the old ones seems to be brown, but really they are getting transparent.

I do 1-2 30%-50% water changes each week.

I dont know what to do, beacuse test says it have enough nitrates, but planta shows symptons of nitrogen defficiency.
 

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