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PPM dropping when lights are off?

Hey guys,
had an interesting question. my plants seem to be eating most when the lights go out. is that normal?
for example today at 9am the lights went out and ppm was 850 (700 scale)
at 3pm ppm was at 710.
Lights go back on @3pm and now 1hr after the lights went on ppm dropped another 20 to 690.
it was similar situation yesterday.
oh i moved these clones into my RDWC on 1-8-
I am new so i was under the impression they would be eating during lights on period but seems like the opposite...

PPM dropping when lights are off?


January 22, 2020 at 12:33AM

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