Not always a bad thing. My corals have been growing like crazy for 6 months with no PE. I had a little at night. Everything has PE now since I have done the following things. Some things I have done: started mixing IO, Oceanic, and Tropic Marin salts at 1:1:1 (it's crazy, but my levels are more stable than ever), feed at exactly the same times every day (always PE before I feed, I think they know somehow), added a Phosban Reactor, and the biggie - treated for redbugs. I didn't have many, but I had a few. I'm no pro, but I had your same problem and now I don't. Good luck!