Can anyone tell me what they're really like? Some internet sites say they can be kept in a community tank while others say they shouldn't be? I know they're really shy. Its just that I saw one today at a LFS and it was really nice! It was a really dark grey (almost black) and had some yellow patches on its face! He was pretty cute, but I didn't wanna do one of those impulse buys. So what do you people think??