Been doing some research on glass knife fish. I've read that true glass knives get to about 8" long, including a very thin tail, and that the 16+" ones are glass knife fish, which are different. Can anyone tell me anything about the glassies? They look really neat, and they seem to have fairly small mouths... Are they okay for communities with very small fish like pencils? I'm researching them, but can't find too much about the true glass knives. I'm looking for approximate needed water conditions, needed food (I feed a mix of frozen foods), tankmate size, and any tips. I know they do that electrical-discharge thing, will that bother the other fish?