Swichin to bloom

I am a first timer in nevada county, and right now my plants are doing fairly good i think. I am going to tie them down with in the next few days, but i was wondering what nutes i should for the bloom, what have people used and what works??? I have a friend that owns a hydro store and he sugested to use " age old bloom" so i got some of that. Also i have really hard water so it cant have much calcium..... What do you think?

get some cal-mag great stuff as a calcium-magnesium supplement for the plants. As for the blooming never used those nutes but hey give em a try. Let us know how they work. Happy Growing .