I personally do not want one, nor do I want a clown knife in general (for now), but can the longfinned ones... swim? I'd imagine it's something like bettas or other fish that normally rely on specific fins for mobility but knives are kind of a weird one based on the way they swim. I have seen videos of babies swimming and they kinda looked like they were tumbling around and couldn't control themselves. That's another thing, are they even able to hit adulthood?