Oh the fish, OH the fish I would have, I would be bursting with fish, you would not believe the sheer number of fish, and the types, do not forget the types, of fish, I would be the biggest, bestest aquarium that it would literally be an ocean.
I would be an ocean, of fish and fish adjacent creatures, all living and having a pretty great time, and I would be sentient, despite being a container of water, and would be smiling at all the water folks loving life, knowing I could give them a pretty sweet place to live.
I would not charge rent to the fishes, it would all be free, for many reasons really, such as fish not having a capital transactional based system of society, or labour structures, or the fact, that as an ocean, I would not have a need for any money. What am I going to spend it on? Some nice landscaping for my coastlines? I will let erosion take care of that!
No, these fishes, these marine mammals they will have the loveliest, most watery wet time of all, and I will protect them all against the human race, I am no longer one of you, I am a sea. An actual full on body of water, and I will turn the tides on extinction!