Thought this was kind of interesting....back in February I put a bunch of scuds in a 20 gallon aquarium. Several weeks later I transferred what I thought was all of them to the pond. The aquarium has been full of Rosey Reds, GSH etc. since then. A week ago I cleared all the fish out and the tank has sat full of water with aeration going. Guess what are now swimming around in the tank. Scuds! Must have been hanging out in the gravel all this time. Kind of explains why this is the only aquarium I couldn't get vegetation going in!