When ya can, if you are not able to now & if you are doing ferts like Miracle Grow, switch to natural &/or organic ferts. Extreme Juice works well. As does FoxFarm nutes. Advanced Hydroponics is good also. Lots of good stuff out there, just if yer not already, try to use organic/natural stuff. Eleanore's VF-11 works well, been usin that for 3-4 years. All available online. VF-11 works in hydro, see what they say at the site.

Also you can use your veg fert for flower. Just add a Tbl spoon or 2 of Epsom salts AND a Tbl spoon or 2 of molasses when ya fert. Both measurements per 1 gal water.

I like auto flowering cannabis also. Good luck!!

mM