Several months ago I purchased a single stalk of pulsing xenia. It came on a small rock about 1/3 the size of a golf ball. When I brought it home I super glued the rock onto a larger piece of branching rock. About 4-5 weeks ago I moved it from center of the tank off to the right to avoid most of the power head force so as to be able to observe the pulsing behavior. Over the last month I watched it streeeetch out about double it's typical length, attach itself mid-stalk to a different portion of the rock it was glued to and then release itself from it's original attachment point. Absolutely amazing. It literallly moved itself closer to the light. I love this hobby.