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Hydroponics CANNA ADDITIVES PK 13/14 Plant Nutrients 5L Litre

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RDWC feeding topping off between res change?

Hi all,
got a question for all the RDWC experts here.
Say my ppm was 990 on the 28th and today its at 910 , should i add back nuts or when do you add back nuts?
my res has auto top off so water level is consistent and ph is spot on 5.8 all the time. I do a res change every 7 to 10 days so was wondering, do i just let the ppm keep dropping till next water change? or top it off to some point? and if so what point? back to 990? or higher lower?
just trying to understand what is the logic...

RDWC feeding topping off between res change?

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