I already have the raph, bullhead, and pleco in my 75G now and the bullhead and pleco will definitely be in this tank no matter what the other fish will be. The raph doesn't need upgraded but if I do a catfish themed tank I'd like to put him in it.
My goal would be to get all the cats to be as active as possible but not have any dithers in midwater, would this be possible to do! If there are certain conditions I could make to make them more active (other than absolutely no lights

Need be, I could add a school of giant danios or the like to make them more active but I'd prefer to stick to an all cats theme.