Dr_Boomanswered grow question 3 years ago Looks like a typical calcium/magnesium defiance. You can make your own cal magnesium. Put some egg shells in the oven or over a grill for an hour to burn off all the organic matter. They will turn black. Now. Crush them as fine as you can. Next, cover them with vinegar and let them sit a couple days. It gets a little stinky. I put one teaspoon per gal. For Magnesium. I put 1 tsp/gal of Epsom salts. Hope that helps.