Seedlings on biobizz all mix

if 1.6EC is correct, it shouldn't be too hot. you can take the little seedling pots and run extra water through them (don't do it to the entire batch of soil, obviously)... this can dilute it before you sow them. Try to be consistent, so you can adjust how much you flush 'next time' .... you can strip the nutes, eventually. Also, adding perlite will help dilute it a bit too. adding anything inert will help reduce overall concentration. I start in promix which has about a 1 EC pre-charge. Sometimes I fertilize immediately with an elemental ppm of 600-some plus (full dose for soilless) whatever tap water adds; sometimes i just add water. There's no difference in my results, not that it's necessarily 1:1 the same... allmix might have some stuff that releases slowly as you water, so effectiveness of flushing may or may not be limited a bit by that fact. got any free seeds? test those first, if concerned. i'm sure you'll be fine either way. Sphagnum peat moss is not 'peat moss' even though people use it somewhat interchangeably. might help your search. Even if not, some nursery or business is near you that sells similar products. I'm sure somenoe has a product that's gentle for seedlings. Some farms have a side business of selling stuff too.