i would see if ya can get some CANNA TERRA for flowering if your gonna start flowering otherwise they do a vegatation mix too
i have had good results with the veg mix and my m8 has had good results with the flowering mix
i think CANNA TERRA is a specially formulated fert for weed anyway so i would go with that
as with super thrive yeah i would use that add i drop per 4 litres of water this can be used no matter what stage ya plant is in
cheers hope this hellps