What size container, and how long are you vegging? THAT will give you an idea when to start adding nutes.

I use GH trio, and I supplement with Flower Fuel and Terpinator. Not sure I'd be mixing nutes from 2 different lines, to begin with. And, depending on the age/ size of the plant, you may well be overfeeding.

 Airy buds, unless they're on a heavy Sativa leaning strain, usually means you need more light.