Transplanted Jack to a 4 gallon grow bag. It's a ProMix and perlite mix.
There are some brown patches on the lower leaves. Likely some nutrient deficiency when it was in the Solo cup. (The crinkled leaf is from a light burn when it was a seedling)
I expect it to be a big growing week for this one.
Looks like calcium to me. Possibly potassium but that usually wont show until flowering. Hard to tell with the current state. But week 4 shows the start of the issue a lot better