Hey there that’s a great question
I think you should avoid adding all kinds of nutrients to a seedling
Start nutrients very weak less is more
Nutrients are not some magic that makes plants grow all fast and stuff they only help plants when they are already on a perfect stride
I personally would fucus on temps and humidity and lighting intensity for now.
I’d wait till the plant is about 30days after it came out the soil until you add silica and make sure not to add to much can make everything rigid