Thanks for the reply, do any of those eat of the bottom better than the others?

Also kinda off topic...when i do water changes, whould i add salt to it them? Or put a little in everyweek?

I have a 225g tank with 2 young Oscars and a small pleco. I am looking for a catfish though. I was just wondering what everyone would suggest. Someone actually suggested a bullhead...but i dunno.

What do you all think?