According to that website, to dose for a 20 gallon tank, you need to do the following "

As per Tom’s recommendations, dose the following once a week or once in two weeks for a 20 gallon tank. If you have a different sized tank, calculate the required fert dose accordingly.

1/4 Teaspoon of Seachem Equilibrium (for traces and Calcium + Magnesium). (1.42 ppm Ca, 0.42 ppm Mg, 3.43 ppm K and 0.02 ppm Fe)

1/8 Teaspoon of KNO3 (Potassium Nitrate) (5.27 ppm NO3 and 3.32 ppm K)

1/32 Teaspoon of KH2PO4 (Potassium Mono Phosphate) (1.61 ppm PO4 and 0.66 ppm K."

The thing is that I have 37 gallon tank, which is 30 long, 12 inches wide, and 24 inches deep. As far as my lights go, I have some Fluval LED. I have been reading a lot about how to dose, and I am getting really confused. I already purchased Seachem Equilibrium, KNO3, and KH2P04. I was wondering if someone could please help me figure out how often and how much ferts I dose into my thank. Thanks.