I know a lot of people use Happy Frog. I was told to add worm castings to my soil but I think 'frog has castings in it. pro and cons to adding the castings?
It’s a pretty muddy mix. Haven’t used it in many years, cause I build my own soil. From what I remember, you’re gonna need to add additional aeration. That would accommodate your desire to add more EWC to the mix as well.
I only use FFHF on the top layer with FFOF beyond that. I use HF at the top because it’s not loaded with nutes so it doesn’t really burn up a seedling. FFOF is loaded with what your plant will need through veg.
I use it and add Perlite and worm castings. They seem to thrive.