magnesium

Hey guys, just had this pop up yesterday. About half of the plants look like this and it's mostly upper leaves that are showing it. I'm guessing magnesium deficient, but I wanted some second oppinions. I just fed them with a little molasses with their water to help some (I know it's got a few...

Cal/Mag deficiency shown with leaf cupping and brown spots. Using nutrients with no minor elements listed in the ingredients. If this looks like something other than a calcium, manganese or magnesium deficiency, please comment.