One of my BN's is a cruise missile when there are Cory eggs to be had. She lounges on her rock, watches the Cories do their thing, waits til they scuttle off elsewhere and thats it, she is onto those egss in a flash and they are gone before the glue is dry....perfect Cory contraception with a 100% success rate so far. Its the only aquarium of the five that has no babies.