Plectrelminthus caudatus (~5" in 3" pot): dark spots → leaf yellows → falls. 6x8 GH, 2 small fans. Damp, water-retentive mix.
Losing lower leaves occasionally normal. Treat like Vandas: basket, coarse mix for drainage. Mix looks damp/retentive. Hang for more air. Dry before rewater. Morning spray with Kocide (copper salt) deters fungal growth in high humidity/retentive mix.
Contact Oak Hill Gardens (oakhillgardens.com)—Greg Butler or Hermann Pigors sell this species, may have more tips.
Not bottom leaf. Lose bottom 2 leaves. Early chlorosis on another → wet conditions spreading fungal spores. Remove 2 lower leaves (no function, spread spores). Expect 3rd loss. Drench with fungicide before repotting (coarse mix, basket). Keep dry, spray weekly. Email Oak Hill Gardens (mention my name—Lisa & Hermann know me). They lecture on diseases; second opinion valuable.
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