LST Super Lemon Haze 1 month from seed with pics, how are things looking?

How do I test the TDS of my soil? I mean I check the water and nutes going in, but I am noticing that going and coming out are probably 2 different things. this is maybe my 4th or 5th grow, all my previous were one plant in different stages at a time, but that was not working because I am no good at this...anyway doesn't matter...I have had a history of nute issues and I feel that once again I have overdone the nitrogen...the run off water after a couple minutes had a TDS of like 793--while I was pouring water with a 156 through the top...the plant is growing well, but I noticed a kinda blue tinge to the edges of the leaves today and it's bugging me...I'm going to try really really hard to leave it alone...because more often than not when I try to fix something I perceive as wrong I make the overall plant worse...Anyway kinda went away from the original question there...so is that the correct way to check the ppm of soil...and what ppm would I be looking for with a SLH that's in a month of veg? It's been growing like crazy and I just keep LSTing the branches everywhere...I think it looks pretty good, I'm feeling pretty good about her.Anyway here she is after a month of veg with her slightly blue leaves.

So.,..bump

looking good, cant help much with your other questions but be sure to ditch the yarn before you flower. the furry stuff will end up in your bud. Its expensive, but i like using plumbing solder from home depot. good luck

The blue leaf tips are unexplained, ppl say it could be the strain, my last grow I had g13 crossed with super lemon haze....
It also had the blue leaf tips, I left it alone cuz it was doing better then all my other plants and it turned out to be some real good dense bud, so id say
Just give it time. As for the ppm testing your doing it right, but I think your run off should be more like 600-700 at a month in, then SLOWLY increase it,
A week before harvest it should be anywhere from 1200-1400 then u starft ur flush. Hope this helps.