Leromeanswered grow question 2 days ago Magnesium deficiency
Calcium and magnesium are common issues on BioBizz so prepare to use bigger amounts of calmag especially in late veg/early flower. You could also pre amend the soil with something like raw gypsum (calcium sulphate), ultra fine basalt or granite rock dust (will provide many micro nutes like iron, copper, zinc, silica,... aswell), , epsom salts (magnesium sulfate). Its good to have those 3 + a CalMag supplement on hand anyways for every grower in my opinion, especially when growing with LED´s which for some reason force a higher demand in plants for calcium and magnesium. Good luck and happy growing!