“I was not dying, I was just waiting for fresher soup.”
This looks like a mostly healthy hydro cannabis run with one plant naturally senescing toward finish and the other plants showing mild, nonspecific yellowing that fits an old or drifting nutrient solution. The fact that new growth looks happier after the reset strongly supports a nutrition / pH / solution-age issue rather than disease or major root failure.
What to do today
Keep the fresh reservoir and watch the newest leaves, not the already-fading fan leaves.
Also possible, but less likely
What would prove it
Recheck the recovery pattern
If the new growth stays greener and the yellowing stops spreading fast, this was most likely just solution-age / uptake imbalance. If pale new growth continues, then pH or root health becomes more likely.
Turn this into a recovery case
One photo gives a diagnosis. Tracking proves whether the plant is recovering.
Don’t leave the diagnosis hanging 🌱
Save it now, then use the next photo to confirm if this was the right call.
Create account & save plant 🌱