Thats what I was thinking. I am going to use a more common sense feeding approach since it seems pretty easy to gauge whether he needs it or not. I have my cichlids on a tried and true method, and from the looks of it, that doesn't translate to catfish that well.
And Richie, the Black Ear is by far the more wild fish. Maybe thats why he seems to maintain his weight. So far the Paroon is pretty relaxed, just does the usual back and forth swimming, with little to no frantic bolting no matter whats going on outside the tank. Any chance you picked up your Black Ear from Nemos? (or Natural Pet, I can't keep up with those name changes) That place is still a rip off but remains one of the best bets locally for me to find more odd fish.
On a side note, I was in Clementon for my sons hockey tournament this past weekend and stopped at Aquarium Center. They have a Nile Perch and two Goliath Tigers for sale right now. Perch was around $90 and the Gtf was $250.