Hey GrowJoe,
As you're using Biobizz biogrow (and biobloom is a good combo) you dont have to flush the plant. As the nutrients you are using are natural only. No chems in sight :)
With biogrow and biobizz light mix you dont need to ph your water either as the soil and nutrients buffer themselves :)
I too use this combo and never flush and get some dense buds!
Looking good, got some nice grow sites
like 1