Iridescent Shark Catfish???

I had this posted under Catfish because I didn't see the shark board. Any help would be great!

My boyfriends father has a 10 gallon tank. He's had it for a few years now, 3-4 I believe. In this tank he only has one fish now. He said when he first got the tank, he had a couple of fish in it. In the 4 years, only one has survived. He calls it his "shark".

Here are some of the things I've noticed...
~It bullies/eats anything that gets put into the tank,
~enjoys the dirty-ish tank (the dad swears that he'd rather not mess with the water and screw up the chemistry - but fish seems okay, I check a lot),
~swims mostly in the corner of the tank towards the right wall, nose to wall,
~swims when the light is off,
~hides when the light is on in the gravel,
~I noticed it had a white-ish sore, the dad bought ick-guard and it seems to be going away...

I need to sneak a picture of it next time I go there but I SWEAR it looks just like the iridescent shark catfish, only, it is about 4 years old, and about 4-5inches long. Is there another kind of shark catfish that isn't listed on fishlore that this could be?? The iridescent is said to grow to be a foot long and live for 10 years. I wanted to know if this IS an I.S.C. ... could it's growth be stunted??

 

ina 10 gal. yeah probably is a little to small for its age, but i'm no expert, a pic would help a lot

 

HOLY ****! that thing has HUGE eyes!
but I have no idea what that is, I'll look at some pics and get back to ya

 

lol thanks!

 

alright, it took me awhile, but I was watching videos on youtube, and that looks like a stunted iridescent shark...it has the "HOLY ****" large eyes and fins look the same

 

lol thanks. It seems you're the only one that will help!