How to fix soil that is too hot?

[Spiney_norman]

How to layer soil

I have 3 seeds in root riot cubes NL auto flowers they are starting to show roots through the cube so they need to get in some soil like now. I wanted to try to layer some soil. I have fox farms happy frog and ocean forest. Since there autos I don’t want to burn them about how much happy frog should I put on top of the ocean forest or does it not make sense to do the layering. I have no other amendments to add to the soil. Wish I had some perlite to add to them but I got what I got. Any help wou…