I am new also and using the Flora series
nutrients and the FloraGro is one part of a 3 part system, FloraGrow, FloraMicro and FloraBloom. It is in 3 parts for different stages of a plants life so you can adjust the levels according to the plants needs. This link
GENERAL HYDROPONICS is a
nutrient calculator just enter the information from the drop down windows and how many gallons your system is and it will give you the amount to add of each in ounces or milliliters. The first 3 FloraGro,Micro and Bloom are needed the other 3 are optional for advanced growers I guess.