I was having trouble with autos, had 5 nute burn within 3 days of sprouting, using MG. Ocean forest is full of nutes right off, organics, earthworm casings, bat guano, ect. What I did with the remaining 3, which recovered nicely from what I would call severe burn (see pic of change), is take a plastic spoon and scoop around the entire seedling, far enough to make sure not to cut the roots. Then knocked off a litle more soil and put some rooting dust on them. Then I scooped out a large portion of the soil and replaced it with jiffy seed starter organic (good ph, no nutes, has worked well for me on seedlings) then
flushed it. After flushing I replaced the sprout and within a few days it was in serious recovery. Still not 100% but it's getting there. I think autos are WAY more likely to have nute burn, I've never had it before using my own soil was just lazy this time around.
(sorry I just misted before taking the last one but you can see the improvement)
