Its been over 2 years and I am trying to get back into the planted tank, My main tank is going to be the 55gal right now I have co2 pumping in (co2 system) 3in of fluorite substrate with some cheap look alike fluorite rocks i got from lowe's 3in. My thing is I have some dry fertilizers from GregWatson.com labels show Potassium sulfate KNO3 , Mono Potassium Phosphate KH2PO4 , Potassium Nitrate-13.5-0-46.2 K2SO4. I also have some Flourish iron, Potassium, excel, Nitrogen, and comprehensive supplement. Would I need any more fertilizers or I am good for now? My thing is if i use the sticky dry fertilizer would i need to get some trace elements? also what is K2SO4 used for and should i dose it in the tank? Sorry for all the question at one time I am just getting excited . 40-60 Gallon Aquariums +/- 1/2 tsp KN03 3x a week +/- 1/8 tsp KH2P04 3x a week +/- 1/8 (10ml) Trace Elements 3x a week