Noel, egg shells are calcium carbonate a constituent of soil not trace element. I do not think Aroids living in rotting vegetation packed full of Humic acid will be to amused.
http://www.exoticrainforest.co...
Please read what the experts have to say about Aroids.
Magnesium, molybdenum, etc you can only find in poop I am afraid, not egg shells. Stop being finicky.
Regards,
Masud.
