Agree with Chizer's advice.
Fertilizer explanation:
Plants basically need 3 "macronutrients" in "larger" quantities, and a host of "micronutrients" in comparably "smaller" quantities (generally refered to as "trace" or micro). These fertilizers, plus light and CO2 = plant survival/growth/health.
The 3 macros:
N (Nitrogen)
P (Phosphorus)
K (Potassium)
The stuff you picked up, the "Tetra Florapride" is basically a mixture of K (Potassium) and Fe (Iron; one of the micronutrients required for plant health). It is a good mix for lower light tanks, because usually lower light tanks do not need extra N (Nitrogen) dosed, as your fish provide enough through fish waste (Nitrates). P (phosphorous) is generally not required to be dosed either, as there is some naturally occurring P in most tap water, and it will be present in your tank. K is pretty safe to have in large quantities in your tank, and it will not be "naturally" occurring, so dosing it in a low light tank is probably a good thing for your plants (I say probably, as some folks grow low light plants fine without dosing any fertilizers).
Now, you can pick up dry versions of fertilizer in 4 different varieties for very cheap, and mix them with water to make your own liquid fertilizers to add to the tank (or some prefer to just directly dose the powder fert into their tank).
KNO3 powder to dose N and some K (potassium Nitrate)
KH2PO4 powder to dose P (mono potassium phosphate)
K2SO4 powder to dose K (potassium sulfate)
"Plantex CSM+B" powder to dose all the required trace elements.
By using 4 different mixes (N, P, K, and Trace), you can control exactly how much of each nutrient you dose. Each tank is different (lighting, bioload, co2, tap water, etc) so this control allows you to keep things balanced in a high light tank, where the extra lighting kicks the plant growth into high gear. Excess nutrients (especially N and P) can cause horrendous algae outbreaks, so controlling the dosing is crucial.
Hope this helps.