8 ounces uncooked linguine
2 tablespoons extra-virgin olive oil, divided
6 ounces bay scallops
6 ounces peeled and deveined medium shrimp
1/2 cup chopped onion
1/4 to 1/2 teaspoon crushed red pepper
3 garlic cloves, minced
2 tablespoons tomato paste
1 (14.5-ounce) can petite-cut diced tomatoes, drained
1/2 cup clam juice
12 littleneck clams
12 mussels, scrubbed and debearded
2 tablespoons chopped fresh parsley
1 tablespoon thinly sliced fresh basil