labifleanswered grow question 6y ago Hey gardener! We don't have any calcium or magnesium issues after 2 weeks of growth since there's always enough to last quite a while in the soil they sell you, and on top of that, you say you're giving fertilizers and calmag, so you shouldn't have any deficiency problems. In my opinion, it could even be an excess of fertilizer or a pH issue. Good luck to you!