I beat my xenia like a mule with flow. They don't pulse but they look awesome in the flow and are now about 8" tall. Ive seen several xenia in peoples tanks and IMO none are as nice looking as mine. Xenia is awesome becuase it works in almost every situation. it loves nitrates, doesnt mind crummy parameters, high flow low flow, doesnt even need much light. mine sits on the bottom of the tank.