My percula went through hell and lived to tell about it. I noticed that my percula had been missing for almost 2 days. At that time I assumed he became fish food for all the other inhabitants. I received a call from my son who was at home and said that the percula is in the sump, alive and well. This means that he had to have traveled into the overflow down into the durso through the hard plumbing under my tank and into, and over the filter sock and into the sump itself. Amazing!!