I am considering a 120gal aquarium, saltwater, what would be a good filter for this? There are so many options, looking to eliminate stuff I don't need.
There's lots of knowledgeable people here more than willing to help, but there's no one right or wrong answer to your question, there's far more than one way to run a saltwater tank. Without knowing more about what you want to keep in yours, it would be very difficult to answer your question.