Ryno_nuggs
Cultivators Club
Thanks for stopping by @Olderfart , you have already had me ask him a 1,000 questions about autopots and have been very helpful.MegaCrop two part has a fair bit of calcium and magnesium in it. You may get away without any cal mag in coco, but if I were you I would have some on hand just in case, and if you use it, do so very sparingly or you will cause more damage than good. If you go with coco, make sure that it is buffered before you plant in it. Have epsoms salt available as well. If it is only slight magnesium issues that come up, you may be able to sort them with a light foliar application of epsoms rather than using up nute headroom with CalMag. If you don't have CalMag yet, I would suggest grabbing some GH Calimagic. It has less nitrogen in it than most alternatives.
Good luck with it.
I agree with all you said and yep, that's the plan so far.