Ansel; Here is something that will help prevent blossom end rot. Don’t over do it though!
https://www.amazon.com/Calcium-Nitrate-15-5-0-0-Fertilizer-Pricing/dp/B071KZBHX3
(I need to get some more from the local nursery.)
Espoma Tomato-Tone is much more balanced. My farmer friend approved!! Not one tomato with blossom end rot after a semi-disastrous first year.