Why why why? Can not figure out why-

My plant is drooping so badly it's the start of the fourth week of flower and just 2 days ago this plant looked alive and vibrant. I am flowering under a sun system lec315 CMH light. I had a tent with 2 other plants u fer the same light and I lost both of them last week. Anyways now this plant is acting the same as the others did. Why is it drooping? Why are all the pistils brown most of the plant loos as if it's done already! I know that's not the case. I flushed the roots with uc mineral descaler. And dropped the nutes to 900 ppm the light is 22" from the canopy. I don't know what else I can do. Oh I also put a dehumidifier in that bathroom. There are 3 fans going. And humidity is at around 60 percent. It does fluctuate 45 - 70. Also this is a blueberry strain

Any help would be appreciated

what are your temps throughout the day? Are your fans pulling fresh air in and exhausting the old air? Not sure about your nute regiment or any issues with any of that shit... I dont use it. Hopefully someone else can help with that.

What is your watering schedule? How often and how much? Are you allowing enough time for pot to dry out?

When a plant is stressed it hermies as a defense mechanism
When pistils turn brown prematurely it's a typical indicator of pregnant girls
I would be surprised if you don't end up with a bunch of seeded weed

They can't handle the nutes. You need a tuffer strain or weaker nutes.