schultz plant food is great stuff!! i use it on all my household plants and used it on my cannabis plants for a while in the beginning. 10-15-10 is too high of a nitrogen content to flower with though. i would say save your money and buy some heavier nutes with some bloom boost. i use humboldt nutrients and their oneness program. this includes oneness, seacal, seamag, and ginormous for bloom. thats about 70 dollars worth of nutes right there though so maybe you need to look for something that comes in a pack with other supplements. my only concern is that regardeless of what you buy to boost flowering, you will still need some base nutes to keep the plants going strong. since you have already been using another nute system, its going to be hard to jump to another and get your levels right. you might look into some neptune nutes as i have bought them before at a local farm supply shop. they provide some good growth and are organic. also, foxfarm nutes are good and can be bought at most lame grow shops. just look for something that has low nitrogen levels and doesnt look wheird. (aw come on!! that one doesnt even have an "h" in it!!) hahaha..