50/50 soil/coco mix...what nutrients soil or coco?

Hi I am about to start a 50/50 coco soil mix (i like to experiment)...but I am wondering if any 1 has any input on this with regards to nutrients do I go soil or coco?
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Make sure whatever you use has calcium in it soil has dolomite lime in it which provides calcium to the plants while coco is a neutral growing medium with no nutrients in it

Cool thanks think I am going to go with soil neutriants and top it up with some extras to soak into the coco for a slower release...all just ideas I am having but it's fun to try. 😃
Thanks for the advice.