with an ACCURATE way of measuring ph I would check as many times as you have to daily (i've done it up to three times a day with sick plants) and keep the ph between 5.6-6.2 I'd certainly stop with the maybes and vague numbers.....find out exactly what is going in and out from your plant both in ph and in ppms.

And give them some nutes back. They definitely need some.....they certainly won't grow well in plain water.
Weedhound Reviewed by Weedhound on . Nute Problems? pics. H=DWC with air stones and ultrasonic fogger T= HydroTon D=Auto drip system- drips about 1 per second E= EVERYONE needs to answer lol! E-indoor E-DWC/hybrid E-HydroTon E-Water source - well water pH'd before adding to res. Rating: 5