I was wondering what I could do to boost the growth my plants in my 55g tank. Right now I have three plants: one Amazon sword, a bunch of dwarf onions and one whose name I’m not sure about. It has long stems and a white flower (only one petal) with something about the size of my pinkie (not as long though) in the middle. The Amazon sword grew very rapidly when I first introduced it in the tank but ever since I added the dwarf onions, it’s been slowing down. Are there any fertilizers or anything I can put in the tank to help them grow a little? I am also planning on putting one or two more plants in the tank in the future. I have asked my LFS but I don’t trust their advice really. Currently I have 2 oscars who haven’t been too destructive with the plants and 1 pleco in the tank. Lighting is provided by two 19W florescent light bulbs.