api plant food

this is what you're looking for... http://www.greenleafaquariums.com/aquarium-fertilizers-supplements/micro-macro-fertilizers.html

i'd get it here... www.aquariumfertilizer.com

if your gh is low pick up some barr's gh booster while you're at it

if you'd rather get it local check out the sticky on ferts/ei in the planted section for specific products for each. one's an enima and one's a tree stump remover...
for dosing instructions check out that sticky.
for root tabs check out riiz's recipe in that sticky.

that should just about cover it.
 
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