While the title of this post puts me in mind of a song performed by Nick Rivers in the 1984 comedy film Top Secret, it’s a question many a novice has posed before setting up his or her first marine aquarium. How basic can it be? Or, put another way, what equipment is absolutely essential and what isn’t?This is a perfectly logical question because ours can be a highly equipment-intensive hobby, and the choices of gear and gadgets designed to make our lives easier can be downright mind-blowing. Add in all the online forum chatter about—and volatile disputes over—the latest-and-greatest hobby technology and methodology, and it’s no surprise that many beginners have a heck of a time distinguishing between the bare essentials and the “bells and whistles.” Complicating matters, of course, is the fact that opinions on what constitutes “essential equipment” can vary widely from one hobbyist to the next. I would humbly submit that the following items are all you really need for a bare-bones saltwater setup: (Note that you’ll also need various and sundry small-ticket items used for regular operation and maintenance, such as aquarium brushes, an algae magnet, etc. Plus, if you plan to keep a reef system, you’ll need to add some means of calcium/alkalinity supplementation to the list.) Some folks might say this list is grossly incomplete while others might contend you could get by without some of the items on it.