I would suggest some small bark on the top of the hydroton. This onc has very thin roots. It does not like to be totally dry. Oncidiums have a variety of root sizes. Thin seems to want dampness, thick can stand being more dry. This makes sence since they inhabit many regions and growing zones, anf the hybrids also are a mix of various growing zones. I've never let my twinkle dry out. Nice fat bulbs and no accordian leaves. Any accordioning and you know there isn't enough moisture or humidity. Also, phals take much less moisture. Notice the different thickness of the roots.
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