In a bowl, combine the Red Florida Grapefruit, White Florida Grapefruit, ¼ cup of the reserved Grapefruit juice, bell pepper, onion, tomatoes, jalapeño, lime zest, lime juice, and olive oil. Season with salt and pepper to taste and gently toss until mixed through. Add the avocado and gently toss until mixed. Cover and set aside at room temperature until ready to serve. The salsa can be made up to 1 hour in advance.