SO yesterday, I opened up Katie's Fluval 306 to make a media adjustment and low and behold... Several tiny ghost shrimp. I knew we had egg bearing females in the tank that we had not moved to the hatchery, but did not think the fry could possibly survive in the main tank. well, it seems that the fry got sucked into the filter and not only survived, but seem to be thriving in there. I found six tiny adolescent shrimp. Seems they like the fast flow and constant food supply, as well as total darkness... Who knew...?