Rdwc help

so I’m new here, I’ve read forums for information but recently joined. I was informed that Rdwc was more difficult than soil grows but I was confident, maybe a lil overly confident. My grow was going pretty good until it wasn’t.

I was using tap water the whole grow thn read how bad tap water was and bought a RO system and started feeding with the RO water...

I did monitor the ppms and Ph level, for the most part I stayed around 5.0... it has been dropping
I used PH up to correct...

I didn’t purchase any cal mag until recently added the recommended dose thn flushed a few days later when plants started getting worst.

Also
I got up to 1300 ppms..
I realize this is too high now

I’m down to 200 after the flush trying to remedy the situation

My questions were...

Is this beyond repair ?

I keep the room in the 70s sometimes high 70s
The water temp around the same.

I’m using GH trio
And Sensi Cal Mag Extra

It's just classic over-feeding. They should come back. Just cut your nutes in half. Get some calibration solution for your TDS meter and see what your real ppm's are.

Thanks, I appreciate it. I was worried.