Trace elements are magnesium, molybdenum and God knows what else, not calcium. Calcium, by the way is calcium carbonate in the shape of egg shells, I don't think Aroids like lime. Sulfer elemental to make the medium acidic, rotting vegetation is acidic not alkaline. Lots of humic acid in there. Noel please go to the following link and meditate on whats written down,
http://www.exoticrainforest.co...
You need the expert now and you will find the expert at the end of that link.
Regards,
Masud.
