Early flower auto do i really need the nutes? FF trio Happy frog soil both auto plants

Do you need to use nutrients? I would suggest testing the soil's electro conductivity through its run-off, that would give you a good sense of how active your soil is. After that, I would say measure how concentrated the salts are in your medium, by testing parts-per-million. If you only added nutes early on, or at least ounce in your plant's life cycle, and if the soil is not re-used, you should receive measurements on the lower end. Unless, it's new soil and it has been helping your plant for 12 or so weeks, then the measurements are probably going to be more in-line with the measurements provided by the soil company, more or less. Either way, I would suggest making a decision once you have the numbers boss.

if the soil can't keep up you start fertilizing. if you use the same stuff it should occur roughly the same time and can pre-empt it. start with low dose and increase. have a plan, but the plant dictates. usually you'll see a hint of paling at bottom, first. Good time to start fertilizing. Start at 1/4 dose with FF. observe and adjust. it will definitely be needed at some point.