Try SE Aruba Fly 'n Dive or Unique sports of Aruba. Both are very good operators and will take you on some great dives. For your ear challenged husband there is a very shallow site called Pedernales that is a nice site for fishes and max depth 25 to 28 feet, they often take open water students there for training and it is also a nice night dive. Water varied between 79 and 81 last week when I was there.