Jim, I am in the same boat... I lost many of my minis this summer from black rot.
The ones I managed to keep alive are in the smallest net pots ( they dry fast so I water more often), I don't put them in regular Neo pots because they stay wet too long. I have had great success with orchiata bark + perlite for my regular Neos, so I think I will move the bean leaves in bark next spring too!
I also find that bean leaves don't like being sprayed ( I tend to spray all my plants because of low humidity in my apartment) , while the regular neos have no trouble with daily spray... Go figure !
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