Evan,
I use a well-draining mix for my Caladiums but I did see a test done where the Caladium pots were partially submerged all the time and the plants seemed to thrive. it kind of makes sense because of their native habitat, which I believe floods in the growing season and is dry in the dormant season. I've seen pictures of Aglaonemas sitting is water up to the stem in native habitat, but not year round. Spathiphyllums can sit in water year round!
When I feed MG, I pour it on with a cup. The only plants I feed and keep in trays are my C. merkusii, peltate Homalomena, Typhonodorum and Synandrospadix. Alocasia sarawakensis might enjoy being in a tray with acid-lovers fert, as might the hybrids I've done using it as one parent.
LariAnn
