one of the coolest, but most boring fish i own is my African Butterflies. theyre really cool, very exotic, very oddball, and i wouldnt trade them for anything... BUT THEYRE SO BORING
the most boring fish that I have (wife likes them) are the two overgrown feeder comets. they cannot be kept with most other fish because they will eat all of the food. they are in my oscar/turtle tank where they just eat any debris and leftovers.
I've had a couple bango catfish that spent there whole lives buried in the sand prob saw then a total of three time when the lights were off. My oscar is boring he swims ultra slow and most of the time just looks at stuff. For some reason he has an obsession with the water coming out of my emperor. Hell sat there for the longest time just looks at it then trys to eat it. So far my bichir is boring spends almost all his time sitting in his cave only had him a couple weeks though he's starts t explore around the outside of his cave.
hah this is easy my peacock eel... I havent actually fully seen his since the day I put him in my tank. Ive seen his head twice and his tail once. My gf used to see him all the time normally as soon as I leave to go home :/ I think hes cool looking but hes boring because I never see him. oh and my Jack Dempseys are pretty lame, all they do is hide from my convicts inside the volcano bubbler I have. thats the only cool thing they do because its funny watching them go down through the bubbles.