In reading about nutes for Florida Tomatoes, it seems they commonly use two nute tanks, which they proportion, into the stream at 1:100. Is calcium nitrate usually held in a separate tank (Stock B the call it) because there is so much of it that mixing a stock of the other nutes would have to occur too often if it were included in the 30 gallon tank (Stock A they call it) -- like do two tanks simply amount to a reservoir of 60 gallons which is preferable to batching 30 gallons of nutrients, or is there some chemistry which makes it reasonable to keep the calcium nitrate in a separate tank.

Here is a link that might be useful: Nutrient Solution Formulation for Hydroponic (...) Tomatoes in Florida