With the coco running off at 1.0-1.2 I dont think that is a problem now the new growth at the tips of those Plants looks ok except from a bit too warm and leaf curl from hitting 31c
No need to flush the pots the plants are in they will handle 1.2 fine now, they have grown through it.
When they have dried out just water using root stim, the seaweed, ph corrected to 6.2-6.5 and all will be fine.
Put your watering can in the safe and lock it for at least 3 days, thats your damage control.
If in doubt think about your wife with the hammer and keep it locked up
You know for the future to rinse your coco.
The fact its a mix of soil coco perlite is a postive in this instance.