Welll...I think your sposed to introduce ferts at 1/4 strength when its at or a little after its 5th node... your plant really only needs nutes for flowering now considering its...already flowering..I would go with foxfarms or try and find some organic nutes for flowering/blooming/fruiting whatever..

Your plants will get alot bigger thanks to the flowering and to the nutes if you introduce them now. Just remember not to add nutes before harvest....stop watering and adding ferts 2 weeks prior to harvest :-)