So i have been doing a lot of reading around. I bought myself a bag of the Seachem Flourite black sand, and also a Hagen's [FONT=arial, helvetica] CO2 Natural Plant System. I have been hearing a lot of people say that I need fert also. I was looking at the Seachem stuff and also the API[/FONT] Leaf Zone. Can some of you guys give me a fertilizer that works the best for you and why? I am not looking for anything that is way expensive!