Problem with cropping 1 before the others in nft

Hi all i got a problem i didnt think through i put a auto flower in for something abit quicker but didnt think about at the end now its ready but the others have just started flowering, what can i do to flush that 1 plant or shall i just crop it an have a harsh smoke im not sure its a 1st grow. I thought about taking the rockwool cube out off the tray cut roots off around it to get it up off the matting but the obvious problem will it kill it by cutting that much root off my guess is yes,
any help id appreciate or have i just made a dumb mistake

Just forget flushing. Run just high enough ppm to keep leaves from yellowing on the others for a week and then cut it. I just leave the stem/net pot in so light can't get in the tubes

Iv got it down to 400ppm about 1 3rd of what it was will that be allright do you reckon, thanks for ur help

To do that i drained what i cauld with a pump then refilled with water adjusted the ph to 5.6 which its bin around anyway
give or take .1

will probably yellow that low. Depending what nutes ur running. Just look at the bottoms tomorrow and see what they look like. If turning light green give a bit more N or grow formula

there is some debate over flushing, some think it makes no difference at all and some think it make the smoke taste less harsh and allot better. My advice (not an expert) would be to do nothing at all. Why? Because it's better to have harsh/potent smoke in one plant (if you believe flushing actually does something) than a whole crop of smoke that's less potent due to malnutrition. Think about it, why risk all your pants health/potency just because of one plants taste. It's not worth it man, don't risk wasting your whole crop. Health and potency is way more important than taste.