Okay...so I think we need to address this here. Adding cal-mag will not fix your old growth. It will only make sure the new growth will not experience the same problem. When possible, take those crappy looking leaves off (they can lead to molds, etc....when you leave them around. Just the maintenance piece of growing.

Cal-mag was the issue...it was locking out all of your nutes...and now you should be fine. Give us an update in a week...If the problem persists. The answer would then be your PH. Some strains like querkle, grape ape, and p kush...always need LOOOOOOW PH levels. 5.2-5.7 would be perfect during VEG! It all depends on your environment, water source, medium, nutes, and strain.

Enjoy your first seedling man...Even my first hydro grow from seed is on here. God damn did I make some rookie mistakes!

Good job so far and Good luck!:hippy: