Yellow leaves

Hey Definitely getting some yellowing leaves is going to happen, or other colors too especially if you under feed or slowly feed less over time and then do a solid flush. If it is a photoperiod plant I'd say 5 weeks is a little early, but if its an autoflower then it's probably right on track to get some leaves start fading out. The only thing i wondered about was the red stems, but the buds are looking slightly purple/redish too so I'm guessing that's a genetic thing instead of a phosphorus deficiency. Id say don't make any corrections as long as your ph is good and let this beauty start putting out some nice colors.👍 Happy harvesting.