Feedings canna nutes with soil, help?

ive got 5 blue mystic in flowering, in soil bat mix and 18ltr pots. Been flowering for 1 week now, in veg 30 days, ive got the full range of nutes which are the following:
canna a+b
rhizotonic
boost
pk
cannazym
just started feeding them just a+b a quater of what it says on the bottle every 2-3 days, just water inberwteen at ph 6.8 when do i start feeding the rest and when? i just want to add i killed my last grow by over feeding them so been carefull this time round, any help would be much appricated
 
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