You know what...
I was looking at your Bulb dearei, and I was wondering...
How much are you fertilizing?
Fertilization for the Bifrenaria aureo-fulva should be eliminated during the cooler months.
Fertilization for the Bulbophyllums should be drastically reduced during the cooler months. This means the concentration and the frequency.
The Bulb. dearei looks like it's suffering from leaf tip burn. This is caused by excess dissolved minerals and nutrients in the water.
What kind of water are you using?
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