So I am growing a critical purple auto and I am using General Hydroponics flora 3 part. I am also using big bloom at 1/4 of the dose. My soil is happy frog and I water every 3 to 4 days depending on how dry the soil is. I have not noticed any pests in my tent. The leaves are turning red and yellow. The plant is in its 5th week of flower and it has an 11 week flowering period. Can anyone help me fix this problem please.



It helps me to track Autos by days. There is no specific "flowering period" to track for autos.
It looks like your taller branches have dried out tips- How close is your light? Any way to crop those over any to even out the canopy? I am unfamiliar with that nutrient line and synthetics as a whole but they do look droopy, could be over/under watered- Yellowing to me means they are hungry most of the time- Also, pH of that plant will tell you if it's uptaking nutrients, so watch that for sure.
keep at it Growmie!