Week 3 discoloration

This white widow plant will be on week 3 this Friday. I’m currently using light warrior seed starter soil with the recommended amount of fish sh!t and mammoth p measured at 6.5 ph however I’m starting to sense a lack of growth and getting weird discoloration. Any suggestions welcome thank you!

Should not be feeding at this stage. Shes overwatered. Need to let that soil dry all the way out.