So I have been reading up a bunch on EI dosing in a low tech setup, and how it can still benefit plants. I have been looking to take my tanks up a level without going to CO2. Now that I have gone a year and started and maintained 4 tanks, I think I am ready to get a bit more advanced.
My question is though, besides starting to EI dose, what should I also start testing for? I notice people talking about testing for things outside my API Freshwater master test kit and I was curious what else I should stock up on.