I have two sets of German Rams. One pair I got from a reputable breeder, the other from a lfs. The ones from the breeder are always in the front of the tank, always eager for food, never hiding. The ones from the store ALWAYS hide. I've had them about a month now, so they've had time to settle in. I'm amazed at the difference. I assume it's from breeding practices?? I guess there isn't anything I can do for the shy pair.