There is a wide variety of equipment which can be hung outside the back and sides of an aquarium. Protein skimmers, water pumps, wet/dry filters and overflow supplied equipment can be found in a variety of styles, made by a number of manufacturers.
The types of equipment which can be mounted or used inside the tank is somewhat limited. However, there are a number of filtration systems which are designed to use only In-Tank equipment and materials. Many SW aquarium purists utilize very few devices and have some of the most fantastic aquariums you will ever see.
Here's the next fork in the road:
YES I want to use Hang-On-Tank equipment. (F)
NO I want to use only In-Tank equipment. (G)
Back To: Choosing a Saltwater Aquarium Filtration System In 5 Easy Steps
