Perhaps not the prettiest fish in the tank.
A small sightless grey fish swims idly around its tank...at least that's what you assume it's doing under the cloth.
Blinky is a small sightless fish that Kat found in a pool in the Underdark and brought back with her. It now lives in a small tank in Castle Kat which is kept under a dark cloth to simulate its lightless birthplace.