If you go with discus, you would need to get rid of all that you have. Get cardinal tetras / neons / rummynoses. You could keep the Clown Loach, but just watch it at night to see if it's hassling the discus. You could also have Bristlenose Catfish in with them as well as cory's. Don't put anything that will attack the discus. They will hide in the corner, go black and probably get sick.
Chris-