Deficiency nutrients?

Hi there, It looks like Phosphorus deficiency and cause of pH imbalance to me.But on the other hand, Plant is using all the energies to make your buds fatten.It’s normal to show deficiencies like that in flowering stage.You will see more and more purple and yellowish leaves when they come close to harvest.So just focus on your water and your run off pH and ppm.For soil keep pH around 6.5 for both water and run off.For soilless. keep around 6.0.Always Maintain dry/wet circle between each watering.Don’t forget to flush if you are using inorganic nutrient.Happy growing... ✌️