Do I need to flush ?

I

 

Wouldn't hurt mate !!! If she's good to go, get flushing! I use organic soil / nutes, so i don't do a huge flush but it never hurts! - Good luck fella

 

Reducing nutes as harvest approaches is a better strategy. They need fewer nutes in late flower.
Irrigation Management Strategies for Medical Cannabis in Controlled Environments

Flushing is a bad practice based on flawed science.

The great flushing experiment: An objective and in depth look at the final weeks

 

I do exactly that bro - Phase the nutes out over the last few weeks and only give plain water.... Less is more sometimes.

 

You can still add unsulfured mollases to the water.