A bit late to the discussion here, but I've also had challenges with Ren Bella, I purchased it from a Floridaesque climate while growing in a Mediterranean one myself.
I had the opposite experience in that it really struggled and immediately lost two lower leaves and settled once I repotted from bark to leca which it at least stopped dying.
The decider seemed for me to be the inability to provided constant hot temperatures, anything lower than 16-17 (around 60f) spells doom for this plant. Given that's the high we get during Winter here with lows around 4c/40f it seems like it will always struggle outside the summer heat.
It did well in the GH over summer with humidity but I can't provide the heat it needs in there over Winter,
so I'm resorting to now keeping in a kitchen window which won't provide it much sunlight unfortunately but won't subject it to the low temps.
Anyway this was an experiment to understand the Ren's thresholds, Vanda's do ok for me but this was a step up in requirements.
Would love to know how yours fared, for me the constant hot temps seemed the crucial element so assume yours must be doing better in the Spring climate.
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