Next, the location chosen should be accessible to drainage and a cold water source. Drainage becomes an issue when doing water changes and other maintenance chores. Running garden hose all over the house to empty a leaky system or to dump waste water can be a real challenge. Also, running freshwater to the system for evaporation duties and refills after cleaning is better facilitated by having a nearby water tap. Remember that evaporation is a continuous process and that salt does NOT evaporate along with the freshwater. This is important if placing your aquarium next to painted drywall. After about 6 months, the salt residue from this process will "soften" the plaster, destroy the finish and make the affected area totally unrepairable. Once done, you'll have to completely cut the softened area out and apply a plaster patch. Simply attaching a Plexiglas sheet to the wall behind the tank eliminates this threat. It's like hanging a clear picture frame, and it's cheap assurance.
Try to choose a location away from direct sunlight. This relates to the excess algae growth issue. Natural sunlight not only can raise the water temperature dramatically, it will also encourage a proliferation of algae growth that can make cleaning and other weekly maintenance chores your daily exercise. The artificial tank lighting we use can create enough of an algae problem without adding fuel to the fire, so-to-speak. Doorways and open windows should also be avoided if you happen to live in Northern environs. The icy blast of cold air when opening and closing an outside door isn't beneficial to saltwater animals. If there's one thing that can be said about nature, she provides a stable living environment and we need to mimic her as much as possible. This reduces the threat of stress, thereby reducing the potential for diseases in our systems.
One last major consideration to be made is space. Your chosen location should allow not only for the actual tank size and stand, but also for accessories and other support equipment. Remember to allow a good 6 to 10 inches of "clear" space between the tank back and your wall. This will allow for future "expansion" of overflow boxes, hang-on protein skimmers and/or other projects. Bear in mind, this is one hobby that can blossom into areas not even conceived of when making the initial buying decision! A simple damsel tank can quickly become a full blown mini-reef system within several months... I know this from personal experience, LOL. Again, once your aquarium is filled it is stationary and even the tiniest of adjustments can cause disaster. Plan ahead!
