First time grower having stress problem with seedling

Rollers, great to be here!

It's an indoor grow in BioBizz AllMix soil on a 200ml every 2-3 days watering schedule. Ph was probably lightly over 7, but next watering is going to be adjusted Ph. Have not yet measured runoff water Ph as I don't want to overwater an already troubled plant. Have used half strength BioGrow solution for a couple waterings, but used straight water after lower leaves started drying.

It's on a 18/6 light schedule and grow box temperature is 28-30 degrees Celsius (82 - 86 F) and the plant is ventilated with a PC fan. Light comes from two CFLs for a total of just over 50 Watts placed 10 cm above plant.

The plant is about 3 weeks old, but looks stunned due to the stress it suffered.

Do you have any ideas what might be wrong with my plant?

It looks like a nute problem. I think so because if it was heat, top leaves are likely to start drying out first.

Hot soil, brimming with Nutes, was then added nutes through watering, and it was a little hot- you saw 85, might have been 90? Water only for two weeks no nutes... in two weeks resume nutes, at 1/4 strength for one week... then up to 1/2 strength... keep room under 85F or suffer a stunted, slow grow...

Temperature has occasionally (but rarely) touched 90, but I moved the grow box now to cooler place where temperature is going to stay around 80.

Checked runoff Ph and it's around 6 - 6.5, so that one's out of the equation for now.

hot soil, like he said. I recommend to anyone growing to never put their seedlings in nutrient rich soil. Problems like what you have can often occur. Not all the time but it does happen. Next time start your seedling off in something like a party cup with 50/50 perlite/vermiculite mix or even equal parts perlite, vermiculite, worm castings (this is what i grow in from start to finish). The worm castings will provide enough minimum nutrients to carry your plant the first 3-4 weeks from sprout then you can transplant that into your nutrient rich mix

Growers, thanks for the heads up on hot soil. Before posting I did extensive research on common plant problems and hot soil did not appear before now as a probable cause.

Lesson learned - all future seedlings are going to get started in a light soil (probably Bio Bizz Light Mix, as this is what I have readily available).

Read that for autos transplant is a problem and that's a main reason why I went with the pre fertilised mix from the start.

Growers, do you think flushing the soil would help at this point?

On another note, given it's an autoflower grow is it worth continuing with those plants given the stress and stun or just start fresh?