More like this one? http://www.aqua-fish.net/imgs/plants...orymbosa-2.jpg
Just googel your plant via images and look at them, just to be sure that's indeed the plant we're talking about.
"Life glo" is I recall right has something like ~6500 Kelvin, so that should be fine with the plants.
What's your hardness in the tank?
Now you're talking to someone who's always had tons planted tanks and never once used fertilizer, so forgive me not knowing the product, but I'm assuming is a all around fertilizer, also has Iron in it?
How long have these plants been in your tank? Sometimes plants that just got introduced, maybe even from completely different water in the store to your tank, take little times to 'take off' and grow again.
Mine however in any of the 55g tanks, once they been established and started growing, there was no holding back for them and I had to trim the tops off weekly to avoid them coming out of the tank.