co2 with dehumidifier in grow room

hey, i had a question
i'm still kinda new at this
I'm using co2 with a dehumidifier
i'm doing rockwool 6 inch hugo and my dehumidifier is set on 50% night and day
wouldn't the dehumidifier suck out all the water from the rockwool when it's sleeping ??
I heard that i'm only suppose to feed them 2x a day, every 4hrs ? or 3x a day ??
or would i just have to feed it (ebb & flow) before the lights come on ??
TIA
 
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