It's weird b/c when I hear others talk about their pep's they say they don't come out except at night. The one's I had were out as much as my cleaner, though they would scurry when your hands were in the water. But daytime, nightime, they were always causeing trouble. Now they are in a friends tank and causeing trouble there too, fortunately my friend dosen't mind and loves them more than anything else he has in the tank. I often wonder if they are another species, but they look just like every picture I have ever seen of one.