I've heard it said that small fish, like you would keep in an aquarium, only have a few seconds of memory. If this is true, why do they develop patterns of behavior? I have two small fish one of them is a Red Molly (I think that is the name) that has developed certain habitual resting areas in the tank. If it has no appreciable memory, does it discover these places anew each time? Or do you think that research may be wrong about the memory of small fish?