first time grower veteren burner

need some advice please
all 4 of my blueberry x jack here have sprouted to 2@ 2 1/2 and 2@1 1/2 inches. growing with F.F.O.F soil in 3 gallon pots. for the past 14 days only used p.h water only. I have G.H nutrients should I start adding gro and bloom?
 
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