Here is the formula for my flower room:
Botanicare Nutrients:
126ml Cal-Mag Plus
150ml Sweet
180ml Liquid Karma
540mlL Pure Bend Pro Bloom
Mix all the nutrients in a spare gallon milk container. Add water and shake well. The whole mix will take an 18 gal rez to 2900 PPM.
You need a PPM meter that goes to at least 2000 PPM.
Add about half of the mix and check your PPM. It will be low so you will have to keep adding nutrients until you get it to 2000 PPM.
It is easy to add more nutes but hard to take them out
If you go over you have to drain some nute/water from the rez and add more plain water.
That's why you want take it slow at first.
Always adjust your PH
after you set your nutrients PPM.