You need 2 weeks to finish maybe 10 days then flush water only til you get yellow leaves.Yellow leaves means it is cannibolizing on itself,this is good.Need pictures.
Water only,when the leaves turn yellow and the plant starts to cannibolize itself you will be ready.Flushing at the end is important.You will maximize your plants this way.
Flushing is good.Either way.If you are having problems w/ur plant 9 out of 10 times flushing will cure the problem.In every grow where I personally have had a plant issue,flushing has helped the issue.
Temp.,Oxygen or lack of.Were plants in the soup?When plants take in nutes it can cause the ph to change.What kind of nutes?You always make up the soup then adjust Ph
Wait til end.Flush w/final flush(Advanced nutrients) at about week 8-9 then straight water til leaves turn yellow and start to die.Then cultivate.Be patient.