Younglings having a def? Can you please give me some advice? Pics

I've noticed some brown spots on a few leaves as well as a little curling up on the leaves. From what I've read it could be Calcuim, Manganese or something else I don't remember exactly what...

Here are the pics:

At first look it could be calcium. Check your PH, that might tell you more.

I dropped in some Cal-Mag today before I posted this, I hope thats it... PH is in the 5.5-6 range