Hi Gary, I'm a fairly new neofinetia falcata grower myself in Oregon.
Regarding the black coloration on the lower part of your second plant, that is usually nothing to be too concerned about. That dark color is caused by anthocyanin pigments, and is a natural feature of some varieties of neofinetia falcata.
Regarding the semi-hydro, I echo the sentiments of others, and advise against it. Neos are epiphytic in nature and are quite adept at going considerable periods without water. Constant moisture would likely quickly lead to rot.
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