Which "Trio" are you talking about?

The "solubles" (Open Sesame/Beastie Buds/Cha Ching) I think are for either soil or hydro--the same product works for both. Definitely OK for soil, and I've tried it in coco with success also. These are kinda "extras" which would complement your regular fert schedule.

In the regular fert line, the Grow Big/Tiger bloom/WTF-is-the-micronute-one, I can't remember...) comes in 2 distinct formulations. One for dirt, one for hydro.

In dirt, I decided the micro-nute one was unnecessary if you're using quality soil. It's got the good organic stuff (worm poop, bat poop, etc.) that's in Ocean Forest, but it's not very concentrated and kinda pricey. (And it's poop.)

HTH, Hermie