Fan leaves changing colour

So I am in flowering now and stopped using nitrogen firtiliser and the soil has no nutrients just using a liquid bloom fertiliser higher PK and watering when the soil is dry and pot is light yet the fan leaves from the lower part of the plant are slowly losing colour and eventually falling off and seems to be progressing up the plant. Anyone have any idea what could be the issue with the plant?
The lower leaves when I was in veg did suffer a bit of overwatering so that will explain the downward cupping of the lower fan leaves but they’re now discoloured and dying off...?

They need nitrogen man, how come you stopped giving them n?

westcoast420 said:

They need nitrogen man, how come you stopped giving them n?

Click to expand...

Alright I’ll feed nitrogen tonight, could this be why my plant is taking forever to flower?
I stopped giving nitrogen because initially I think I may have given too much during veg and had a lot of issues so I was a little scared off by it and always kept reading to just feed PK nutrients during flowering. So thanks for that I shall use some liquid tomato fertiliser for this plant now.