Well, you gotta be using those worm castings at a really low clip in seedling soils, bro because for the for the most part a seedling when it sprouts, all right it comes equipped with more than enough of the nutrients that it’s gonna need already present in itself from incubation, all the way through to veg.
It’s one of the main reasons why a lot of us will preach not using any nutrients for the first 2 to 3 weeks, (this varies depending on genetics and strain vigor, some strains get to veg faster) it’s really easy to kinda kneecap yourself out of the gate by having too many of these base nutrients, and too high of ratios too soon it can also confuse newer growers because seedling is when they start to show different symptoms from let’s say a nitrogen toxicity very early. Let’s say at the same time you may be watering a little bit too much a nitrogen deficiency can also look exactly like over watering, for example which can then cause a tailspin when a well meaning new grower starts to throw the kitchen sink at a seedling trying to figure out exactly what they need to do to fix it when all they’re really doing is compounding issues at that point so I always try to say keep the soil pretty basic if you’re gonna run a specific to seedling medium because with what you’re saying, coupled with bone and blood meal on top of a worm casting that’s a pretty hot soil man did your seedlings turn out OK or do you cut it with a more tempered soil in order to bring the heat down
RIP Nalla 
