In a bowl combine watermelon, green bell pepper, onion, jalapeo, and lime juice, and season with a little salt and pepper. Stir to combine and reserve.
In a shallow dish combine corn flake crumbs, dry mustard, coriander and paprika. Season tilapia fillets with salt and pepper, then coat them thoroughly in the seasoned corn flake crumbs.
Preheat a large non-stick skillet with 2 turns of the pan of EVOO, about 2 tablespoons, over medium-high heat.
Once the oil starts to ripple, add the tilapia and cook for 3-4 minutes on each side, or until cooked through.
Top the fish with some of the watermelon salsa and serve.