Amended mix from seed?

Could I use LC's soilless #1 dry amended with kelp at 1tbsp/gallon, bone at 2tbsp/gallon, and blood at 1tbsp/gallon right from seed? Or is this too hot?

And yes, I've let it cook for two weeks.

Thanks in advance!

IDK to be honest.

What I HAVE used for seedlings was used/recycled LC's mix, un amended, to both pop seeds and for the first couple weeks of growth.

Worked great, but needed to be transplanted into fresh or re-amended mix after a couple of weeks, since it was so depleted.

But, I had much better initial growth than seeds planted in fresh mix. Just an observation.

Wet