Place haddock in a Dutch oven; cover with water. Bring to a boil over medium heat. Reduce heat; simmer, uncovered, for 20 minutes. Add the shrimp and scallops; simmer 10 minutes longer. Drain, reserving 2 cups cooking liquid; set liquid and seafood aside., In a soup kettle, cook bacon over medium heat until crisp; drain on paper towels. In the drippings, saute onions until tender. Stir in flour until blended. Gradually stir in reserved cooking liquid. Bring to a boil; cook and stir for 2 minutes or until thickened. Reduce heat. Add potatoes; cover and cook for 15-20 minutes or until potatoes are tender., Add the milk, seafood, butter, parsley, salt, lemon-pepper and pepper; heat through. Sprinkle with bacon.