Orchids sick. Please help

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The dark ends of the leaves and crown look like rot to me. Try repotting in new (dry) bark and let plant dry out for 1 week prior to watering again. Make sure pot allows good drainage and get these plants onto an aerated bed of some kind....maybe pebbles. Look really good at the roots and cut off any which look rotted with a sterile knife. Good luck! How much sun do they get?