With the GH 3 Part, could I use it even though I'm not growing hydro?

If I go with an all purpose, I take it it should be 5-5-5, 10-10-10, or 20-20-20, something balanced. I noticed GH 3 Part isn't as balanced as all purpose. Since I'll be at a store with hopefully a variety of options to chose from, which would be best as far as 5-5-5, 10-10-10, and 20-20-20?

I was also unaware of how beneficial Super Thrive is. I read the Super Thrive thread. I was under the impression that it would kill/harm a young plant, or burn it somehow. I had no idea of all the uses!