Aquarium accessories necessary to complete your fish tank setup. A well decorated tank can be a very nice accent to almost any room in your home or business. The decorations make the tank more appealing and help the tank work with the other decor in the room. Decorating the tank will make the fish more comfortable. Most fish are well aware that they are prey animals, and as such will be stressed and uncomfortable if they feel exposed and vulnerable. A well decorated tank will increase its inhabitants' feeling of well being, alleviating this stress, thereby improving their immune system and therefore their ability to resist disease and heal.