Depends how heavily you want to plant it and what plants. I would recommend T5 HO
to get mid light level plants. It'll give you more options in the long run. A good substrate fertilizer is your best bet. The liquid fetz are expensive and require a lot for a 100g the liquid fertz have to be added often whereas the substrate sits under the gravel or is mixed in.
You should plan out how heavily planted, what plants, and fish yes/no
The more you decide/know the better your options!