HELP! Concerned about the color of my leaves

[amkdux]

I have been growing an unknown strain from a seed that I received from a friend. I originally thought I was doing great, watering every day and seeing new growth and adding a tiny bit of nutes with Miracle-Gro. Until I started researching more, and got worried. Maybe I'm overthinking. Here's the situation


Obviously I am not an expert grower, this is my second time (first time the seedling stretched and I didn't care enough to try to fix it so I culled it), but I'm trying to do better this time. I forgot to mention I do this in my bedroom, but do not turn on the light (I took the lighbulb out just in case)

Seedling is 17 days old from germination, with a 75w "blurple" light ~15-17in above the top leaves set on a 18/6 light schedule.
Humidity is hard to control for me, but I try to keep it around 60%, it sometimes gets to around 40% which I try to fix immediately. Temperature is easier to control, but during the night it can get to the 60s (F) which is when I turn on a heater. Daytime can get up to 80F which is when I turn on the AC fan (I also have a regular fan running constantly, parallel to the plant, but not facing it) I've watered it everyday until today, which is the day after I transplanted it to a bigger pot (soil on top is still a little damp).
I can't test the pH of the water I'm giving it until tomorrow (Saturday the 12th), but so far I've been using Clover Valley spring water. Maybe I should mention this, but I've never experienced any runoff.

Two of the attached pictures show the plant after I took a picture of it in total darkness (side and top-down) with my flash on and the other is my setup as of right now.

Any brown specs are dirt that I couldn't get off after transplanting.

I'm case pictures are not loading, here is imgur: https://imgur.com/a/NBPDMpP

[Rwise]

Your pics did not make it.
Sounds like you need to read on watering, things like lift the pot to see if it is lite or not, water when lite. (should get about 10% runoff)
The PH is very very important, measure it going in and coming out.
What is the soil PH?
Hit the links at the top of this page, Plant Problems link has very nice pics and great info.
Welcome to GWE

[amkdux]

I wonder why the pics didn't work, hmm, oh well. Here's an imgur link I made instead. Also thank you for the welcome

https://imgur.com/a/NBPDMpP

[amkdux]

Yesterday, I had to flush my pot because it was showing signs of nutrient toxicity, with the drooping, dark and shiny leaves, yellow tips.


Also I managed to get my pH meter working, sadly it does not measure ppm but okay I guess.

I flushed it about 3 times with purified water, but the water I use to normally water it is just store bough spring water (switching to ~6.5 pH distilled water after this, as I have a sneaking suspicion that my soil can easily get hot, as I used miracle grow). I guess I'll just have to keep flushing it every now and then.

Maybe I should mention that the runoff water pH was ~8. I would have flushed it again with the distilled water, but I had to leave.

Hopefully the pictures attach this time of a few I just took now.

[Rwise]

You will need to add something to the Distilled water like calmag so the PH meter can read it. There is nothing in distilled water to read, and it can be acidic as it picks up CO2 (which can be boiled off). Drop the PH going in to 6.0 - 6.2 for the next round, 8 is to high and the soil is higher.
I would also consider adding more soil up o the bottom leaves. She looks thin at the base.

[SoOrbudgal]

That looks like it's gonna topple over

[amkdux]

I added more soil, enough to cover ~1-2in of the stem at the bottom.