does anyone read the tags at the bottom

3

Erik and I were looking around petsmart and in one of the fish tanks there was this weird ass thing
It looked like it was just floating but it only went up and down
Like all the way up to the surface and then halfway back down to the bottom
It was in the tank for this one really cool fish that was black with a white tipped tail and the fish looked sort of like an eel in that it didn’t have any obvious fins but it had a long strip of rippling skin. Erik read the name but I can’t remember what it was called. Black Something
Anyway does anyone know what this weird dandelion looking thing is? scalestails askscalestails (tagging them because they know loads on fish)