I have (2) ZooMed pumps and the sponge that comes with it, they like to stay right on that and hide right against the back side of the tank other than that they hide under some of my rock work, The other day I saw one of them almost got caught by my anemone and almost became lunch but he got away. They only are out in the open when I feed the tank because they have a real good sense of smell I think and they go right for the food...