Need a new cool aggressive catfish

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If you want any aggressive cat fish you should really up your filtration to turn over at least 10x a hour. Catfish are messy bro. But when you do that I would suggest a
bumblebee catfish
http://www.planetcatfish.com/catelog/species.php?species_id=721
a bull head maybe
maybe even a gulper though im not to sure with the width of your tank also would prob eat your other fish....

I dont know much about cats but I def agree that 10x turnover would be best

 

[Desert Bus]

I think Bumble Bee, as mentioned earlier in this thread. I wouldn't do a Lima in a tank with a 15" depth.

There are lots of cool Plecos in the 9-12" length though.