Aqua pods are a great setup for fresh or salt water aquariums. They are built to offer the best technology in maintaining water parameters. This is essential in maintaining a healthy well stocked tank. If you plan to add corals to a salt water tank a skimmer must be added to this setup.
In the marine tank, pods, or copepods, are tiny crustaceans living in your tank. They come on liverock and are beneficial for inhabitants. If you need more, research a refugium.
Well you want to make sure that they are cleaned quite frequently. Also you can purchase them at any major pet store or also you can buy them online at ebay.