Plant drying out! Please help!

My plants leaves starting drying and going brown out at an alarming rate. How can i save it?

Did you have any problems in veg? Describe the vegging plants, were they nice and green with perky leaves? How far into flowering were they when this started? Have you checked the Ph of the soil, your water or your fertilizer solutions? What are you feeding them?

i properly set the ph for everything that goes into the plant. Been giving it tomato/vege ferts 15 15 30. I had a lot of problems with this plant in vegging, it was neglected a little but was fixed and later flourished. Ill show some pics of early veg.

Day 28
Day 36
Day 54

It started pretty late in the flowering cycle, it started with the lower fan leaves which i thought was normal and now the top leaves are all dying too.

it may very well just be heat but i got it in a nice open room, im not sure how to cool the air without letting light leak.

I think it's Phosphorus deficient at least. Try to give it a Guano tea as soon as you can.

The twisting of the tips of the larger leaves in the picture at 54 days looks like it could be an early sign of a pH problem. I saw where you said you have kept up on your pH but I would still suggest double checking the pH of your soil and water ... but first make sure your pH meter is calibrated correctly so you know your soil and water readings are correct.