Barbs are energetic fish that school in teams of at least 5 and can't be held with sluggish or weak tank mates as they may be very reckless. The bonnethead shrimpfish has become the rarest fish globally, combined with the marbled river stingray as well as the melon-headed whale shark. https://customfishtank.blogspot.com/2025/01/how-to-keep-your-fish-pond-clean.html