It also depends on what the plant is used to. I put myrio green, bacopa caroliniana, rotala rotundifolia, java fern, a melon sword, and java moss in my 20gL. Everything died (except for the moss) due to too *much* light. I had that rotala in a 10g for two years and it took over half the tank, then it all died in a month. You really have to be careful with plants. I have ALL of my plants growing in my 10g right now. I'm honestly not even planning to put it in my 20. The only things in the 20 are the moss, and some new water sprite and hornwort. That tank now has NO light and the plants are growing fine.
Anyways, I had TERRIBLE BBA where I literally scrapped all my plants and got new stuff. It took a whole weekend for me to clean that tank how I wanted to, then it took me another week to put the plants on how I wanted them. I usually don't fertilize. But I have a homemade red clay fert with slow release capsules in it filled with osmocote. Hopefully it'll do well, yes?
Still, I do hope for the best with your tank! Try and buy some hardy plants that will grow nicely, such as a sword or crypt. I also like rotala, bacopa varieties, and cabomba.
100g Native Fish Pond, 55g Goldfish/Catfish Community, 50g Plant Pond, 40gB Tetra/Cory Community, 20gHM Community, 20gH Turtle (Bender [RES]), 20gL Turtle (Kif [YBS]), 15g Reef, 5.5g Betta (Okami), 5gFBH Betta (Pron), 5gHex Betta (Twister)
2 dogs, 13 cats, 2 turtles, 1 bearded dragon and 1 crested gecko