Ok, so I have the crustacean mix and gypsum, so don't need the other two, or do I?On your CaCo3 question - egg shells need to be broken down chemically with I think Vinegar over a 2 week or so time frame. I never did it that way. The egg shells without being broken down take a very long time to decomp. I stopped adding them to my vermi-bins for that reason. They are good for aeration but take longer to break down than say rice hulls. So a few years. You cannabis plants gonna need that Ca well before that.
I have several sources of Ca - this is where you can add these to the vermi bins and your compost will be gold.
Oyster shell flour
fish bone meal
crab/crustacean meal
Gypsum
These are the Ca sources I use and Coots does the same. Can add any or all of these to your vermi-bin and your soil mix. Also I will add a few handfuls of Kelp Meal to the vermi-bins from time to time as well.
You get your vermi-bins dialed in and its water for the win. I stopped making compost teas since that exercise is not required since everything already there in the soil/compost. Basically compost tea is just watered down compost so just use the compost as a top dress and water in. There's your compost tea.
And, as part of my KNF exercise, I have a bottle of the eggshells in vinegar. Basically, heat them up to dry them out and burn off any organic residue, then mix 1part eggshell to 9 or 10 parts vinegar. Let the chemical reaction happen over a few weeks and then it is plant available calcium, diluted 1:1000, so 3/4 tsp / gal or so.
But I didn't think the Coots mix called for all of those. I'm anxious to get my soil mix started, but don't want to have to redo it if I can get it right to start with.