Mom's Seafood Pasta Salad for a Crowd

INGREDIENTS

• 1 (32 ounce) package dried small pasta shells
• 4 stalks celery, chopped
• 4 green onions, chopped
• 1/2 (16 ounce) bottle French dressing
• 1/2 (16 ounce) bottle thousand island dressing
• 1/2 cup mayonnaise
• 2 (6 ounce) cans water packed tuna, drained and flaked
• 2 (6 ounce) cans tiny shrimp, drained