Yellowing leaves

Looks exactly how my ladies did a week or two ago and they were definitely over watered. For whatever reason, I struggle with water drainage in solo cups despite large holes (4 dime size holes) and have too much water retention. I just transplanted into their forever pot to dry out and they rebounded within a day or two

Check PH level.....I'm guessing you lacking nutrition in this soul....Im having the same issue with 1 of mine I'm putting it in the ground tomorrow...water only when top soil is dry....are you using cal mag or any nutes or any PH stabiliser?

To small to be a deficiency. My guess would be over watering or your medimum is to hot( has to many nuturents in it) and is burning the roots causing it to not beable to absorb nuturents correctly. Do you have drain holes in the cup? do you let the soil dry down the 1" below the surface? If no then your most likely drowning hte roots causing rot. Are you using biobuzz "AllMix"? Are you feeding bottled nutrients when you water? If yes then you got some nuturents butn. Only other thing I could see is light burn. what kind of light are you using? So to cap it off What kind of soil are you using? Are you adding/feeding nuturents and if so what kind? what kind of light are you using, Is it dimmed and how close is it to your plant? What is the daytime high temp and humidity?

Check the ph of your water and the temperature of the room, also what kind of soil do you use? This Color could be a sign of nitrogen deficiency.