I worry also about the blue jack, might be best to try to add a larger ebjd. The problem is that the aro of course grows quickly, as well as the oscar which you mentioned as a possibility...and the ebjd and clown loaches you're looking at are slow growers. Same with dats and prochilodus. Not saying it won't work, and adults of all of those would probably do fine, but if they don't grow quick enough they might end up lunch.
Do you maybe have a different tank that you could grow some of them out in?
Re: red fish, I can't think of an obvious fit. There are fish with red on them that would work great in there though (school of red hooks, redtail chalceus)...or maybe a rotkeil severum in place of the fh.
Also agreed with MsPoly, some endlis would be cool. Maybe a lima shovelnose if you like cats.
