I have my pumps on a remote switch, so what I do sometimes, is turn the pumps off, and put a few frozen food pieces in front of the outlet, and I wait for all the nassarius, hermits, and fish to come to the outlet, and then BAM i shoot them all over the place. It's so great! I actually chipped my acrylic with a hermit hitting the front of the tank =(( cruel? Not really... they aren't harmed =)