The brown edges are a sign of nute burn or overwatering.
two of three pics show that…especially the bigger one in the clear cup. both the cupped seedlings are past due to have a 5 gallon home.
PPM is high of two of the plants. Test strips and colored water are worthless for accurate PH reading.
Growing IS a learning process. Keep in mind diff strains grow diff. Best to get comfy with one that does what you want. Learn to read the leaves…crinkled is showing a little too much of something. PH or ntutes are usually the cause. Curled leaves…major nute overload.
KISS…keep it simple and dun stress yourself.