Q.Amt Of Epsom Salt For 2gal Water Chamber On Growbox For Bell Peppers 8plants
Added dolomite as directed to potting mix and used organic 3-5-5 fertilizer from garden patch grow box supply. Plants look great but peppers developed end rot. Picture attached.

Certified GKH Gardening Expert
If you have added dolomite as directed, then I would not add epsom salts, or if you do then add very very little. Dolomitic lime takes some time to break down, but will contain the calcium AND magnesium necessary for proper uptake.
Make sure to test your soil periodically. These results will help you to keep your soil amended.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/test-soil-for-pests-and-diseases.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/making-sure-soil-drains-well.htm
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm
https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-tomatoes-guide.htm