+1. Anemones don't move around unless they aren't happy with their current location...too much flow, not enough light. If he gets caught in that intake and dies its big problems for your tank. Like duke said, you have to figure it out. If he keeps traveling, he will eventually sting other corals that are in his way.never put foam on your drain pipe.it can/will get clogged. there is a reason your anemone is moving around which is probably it isnt happy with flow,light or both. you need to figure out why it is not happy.