Some higher-end models include UV light purification for added cleanliness ... so make sure you are accurately sizing your aquarium to your filter if you choose to use an internal filter.

【Wide Applicability】Scalable: 0.8-6.3inch, adjustable height: 7.8-13.7inch, extendable stainless steel bracket allows the fish tank light can be perfectly adapted to tanks of different sizes.

External Filters Suit Large Aquariums These are the largest filters as well as the most powerful. They typically have a flow ...