I had a long reply written out, but the cannabis.com server crapped out during posting. In short:

Thanks very much stinkyattic. I'm going to try to fix the plant without unpotting it. I'm a first timer, and I had no idea about how bad peat was. The peat was added during repotting when i ran out of regular soil. I used a 50/50 mix, and it is around the original dirt ball about 4-6 inches deep.

I'm going to the hydroponics store soon, what exactly should I buy?

is 18-24-24 fert bad?
Do I need micronutrients?
PH up is only for the soil?