Hey bud. Did a little poking around SoHum's site as I'm not familiar. The first bullet point on the 'best practices' page makes me worry for your little ones.
https://sohumsoils.com/best-practices/
What they are saying is a strong statement coming from a company that obviously wants to make money selling more of its product. For them to be so forthcoming about it makes me think that the problem is very real. I have a feeling that more experienced growers may suggest a thorough flush but that would worry me as they are still so young.
Part of me is wondering what would happen if you purposely caused nutrient lock-out by only feeding her alkaline water for a while. In theory, my thinking is that this could decrease the availability of excess nutrients in the 'hot' soil. This is not really advice, of course, just something that came to mind.
I'll be doing some research for you and if I can find anything, I'll be sure to link you. Oh, also, the questions feature of this site has been helpful for me in the past. Might be worth a shot. 🤞
Edit: After a quick look around for how to remedy 'hot' soil for seedlings, the potentially good news is that if/as the sprouts get bigger they'll eventually take to the nutrients, but until then it may be a bit of a sketchy ride. That said, I've seen most people suggest flushing with clean water ideally Ph'd (~6.5) at 2-3 times the volume of the pot. Some folks gently transplanted into seed starter but there's always the worry of stunting autos when doing that. Or some, just let them go and hoped for the best which seemed to work for them. Also, I imagine if you did a flush, distilled water might be beneficial as it might 'leech' more of the excess water-soluble minerals away, but that's just my conjecture.
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