Just in potting mix and perlite 60/40. Plant has had no nutes and was transplanted with just water. 3 gallon pot and half gallon of water. Will start nutes when she dries out. PH of water is around 6.8, not sure how accurate meter is. Transplanted 3 others the same way and they are doing ok. Plant was nice and dark green when repotted. Can I use Epsom salt foliar spray on all plants? Will start nutes half strength when dried out.
What type of potting mix? Some are pretty strong out the bag, ph can vary a little too.
If you haven't been adjusting the water's ph, 6.8 is absolutely fine imo. If you've been adjusting ph to 6.8, i would calibrate your meter and make sure it's accurate.
Someone will likely hate me suggesting you test the ph of your soil, but that is where I would start.
Grow with soil myself. Check my soil's ph maybe once a year, if that. But it absolutely does matter and is important, just most of the time will already be in the right range.
If the potting mix has a ph any lower than low 6's, i'd say it's a problem and likely won't change much without amendments.
Good idea letting it dry out, maybe best you can do right now.
I'd hold off on nutrient myself, until you have a fair guess as to what's going on. Likely has more than enough already, maybe even too much, if transplanted healthy.
Five days isn't a lot of time at all, to go from optimal health to those pics. Ime while root rot can do significant damage and quickly, it takes a little time to establish itself.
I'm leaning towards something a miss with the potting mix. Too strong, or possibly ph.
List the brand and type etc, someone may use the same one.