I do not think these are signs of cal/mag deficiency, which shows up a polka dots on the leaves, and it looks more like a potassium deficiency to me.
By the way, molasses doesn't really do anything, it is an urban myth in my opinion.
If you want to really make your plants happy, look for something with either humic acid, fulvic acid or amino acids. If you can find a product with all 3, your plants will really love you!