These plants are on day 3 of flush - all are fine except this one which is showing burnt and crispy leafs - it didnt before when on nutes - so why now just on water? is it best to cut this plant a few days early? Many thanks! :)
Since you are flushing the plant it's using up all the nutrients in the soil which it should be doing during the flush, there is no need to cut early this is entirely normal growmie including the fading your seeing in the leaves.
I would just cut on schedule with everything else or when done. The fade at end is suppose to drain any energy stored in plants and get away from nutes still being in plant for consumption.