Everything is staying in the bottom 3rd thoughI would leave it at that the sd's will provide more than enough action.
It may not be of concern to you but to my way of thinking the barbs would look a little out of place.Might get a good size school of red line torpedo barbs
They will eat my cory's won't they?It may not be of concern to you but to my way of thinking the barbs would look a little out of place.
The rest of your fish will be south American.
If you wanted something for the top levels,maybe pink tailed chalceus would be an option.They always patrol near the surface.