Answer: The Ctenanthe are related to Calathea and Maranta. The common name for Maranta is "prayer plant" -- the name describes the way it folds itself up at night. This is a long winded way of saying I think what you are seeing is probably normal. Give it ample humidity and indirect light. It will tolerate lower light levels, does best in medium light but never direct sun. As long as the foliage is not showing signs of tip burn or drying, it is probably fine. I hope this helps!
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