Under feeding?

Ph 6.4
Strain wedding cake x purple punch from ripper seeds
Food is remo nutrients

Nobody can tell you that without knowing a lot more info. Check my signature, come back with the answers, and then people will be able to help you figure out your issue.

Can you explain your feeding schedule

What’s your EC? Growing medium? How much run off if any? Temp of room humidity. Root zone temp. Water temp ? How many fans do you have in your room currently. Exhausted or closed system. How far away are your lights currently ? How’s the light penetration underneath the canopy?

Almost looks like a nitrogen toxicity. I don’t know for sure yet ......