For the last 2 or 3 weeks my anemone won't stay in one spot. I've tested the water, done 3 water changes and nothing is making it happy. This morning I woke up and it was caught in the overflow. I got it out (well, I turned off the pump and it came out on it's own). I thought that it was on here that I saw something about putting it in a PVC pipe so it can't move. Is that right? Why do you think it's moving so much? It sat in the same spot for 3 months just fine.