The reality here, is that with large predatory cichlids, any dither added will eventally end up a feeder fish..Yep, those large predatory new world cichlids(both central and south American) are what I'm talking about. Although they're 2" at the moment.
Another eventuality is that trying to keep any more than just one pair of these predatory cichlids, long term, in anything less than a 6ft foot tank is quite delusional.