First time. Leaves look weird.

Hey guys any idea what’s happening to this tiny one. The leaves seem to turn yellow slowly. The other ones are fine. The one in green is gorilla glue auto and the rest two are both forbidden fruit. I don’t know if they are auto or fem yet. I’ve been watering every 4-5 days with 500ml water. Go ahead roast me guys but please do give some valuable feedback as well :) I’m just learning.