Im watering we've 3 or 4th day too. I've been ph the water in to around 6.5, I I that a ppm meter, not turned it on yet.
By the time the next water comes, Ill be moving my plants into a 5 gallon fabric pot. Going to get some richer (if that's the right term) soil.
I'll repot them, and sample the run off from a test pot with a little soil in, to get the Base reading of the veg soil I choose. Then I suppose I ll just keep a record of ppm from then on.
I have a cart I've been keeping every day, heat, humidity, wether I watered or not etc. And have some notes with it. So I'll add a ppm coloum to it.
We do have a type of wall mart, ASDA, it's owned by wall mart actually, but they are nowhere near the size of yours. Yours are amazing places. Ours doent sell shotguns of car parts. (the one in florida did). All our supermarkets have a small "green section" but it's not the place to buy decent stuff, and it will come at a premium. Amazon is my best bet. I'll have a look around.
Ive been watching a YouTube grow, and I'm sure he used big bloom or somthing, but he was really late at starting. He uses fox farm soil (we don't get that), and alternated just water, and a water seaweed extract mix. From quite early, then only a Coupe of feeds through the whole grow.
Then I read thimgs like the grow bible, and that says anther, them someone else give you a 3rd option. So it gets confusing.
Cheers for your input. Gonna read up and watch up on fimm and topping tomorrow. 1am now.