Of the many Koi betta varieties, the Samurai would be the rarest, with wonderful dragon scaling coupled with marble, and is available in tons of different colours. The Black Ghost Knife fish provides excess unusual form and movement to your tank! Having no dorsal or caudal fins, they slip throughout https://www.diigo.com/item/note/9tt3x/269w?k=105a0e1b71aa3baffb97c7838685972a