This grow has some nutrient burn in it and lock out from all the extra nutrients in the medium.
A flush would be best to try and save it, As much as i hate flushing soil based grows as it compacts the roots and can cut off oxygen supply there is a safe way to do it.
Use a low flow sprayer like you see from dollar stores for plants, something with a hand pump and just slowly spray the medium with PH's water till it runs mostly clear and your EC/PPM is with range. Will need to do multiple sprays most likely. monitoring the EC/PPM of the run off is how you know your done, but its not 100% needed just a good tool to have.
If you have water pooling on top of the medium waiting to flush through it hold off and lower the flow. collect all the dripping from the plants into something else and use it in an outdoor garden it is food but just to much food for the plants in question. I would also dilute it 3-1 water to plant drips.
After this is all done let it drink up the remaining water for a day or two and then give them an appropriate amount of fertilizer. You should invest into getting an TDS pen, they measure the feeding solutions EC/PPM and can help determining the correct concentrations. If this is not an option, 1/2 or even 1/3-1/4 suggested nutrient doses will work well.
Given that your growing Autos this is the basic frame work I work off of for concentrations.
https://www.autoflower.net/forums/threads/med-man-method-feeding-chart-ppm-ec.47856/
Best Of Luck!
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