Melt butter in pot over medium heat. Add onions and celery and saute until softened.Add cayenne pepper, old bay, thyme, marojam and stir to incorporate.Add flour and stir.Add seafood stock, milk, cream of potato soup and cream of celery soup. Stir and bring to boil.Once boiling, add shrimp, mussells, and crab meat. Stir to ensure all seafood is covered. Leave in broth until fully cooked, about 6 minutes.Soup is done when shrimp is pink color.