What chemicals or fert do I need?

[1977]

I need to know what fertilizers or chemicals are needed for my plants. I'm using flourite and pool filter sand as substrate, no co2. sword plants mostly

[Polar_Bear]

You may need no fertilizers at all. Without injecting CO2 your demand will be low (there are so many factors in determing whether or not you do need fertilizers that I would need to write a long article decriibng even some of them). If you do decide to fertilize I would start at once a week with something like PMDD Pre-Mix from here:
http://www.aquariumfertilizer.com/store/aquaticplantfood.php