Of course, it also occurs to me that I haven't been getting good skimming lately...the bioload in my tank seems to be so low that I have to adjust the Euro-Reef farther and farther up in order to get skimmate. I went several days without anything at all from the skimmer...I suppose it's possible that something has built up just enough to annoy the zoos. Or maybe I'm on crack again, I don't know. We'll see if keeping the skimmer properly adjusted and running a polyfilter does the job.