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2 of the most important elements in marine fish keeping are the filtration and the lighting system.  Filtration systems in marine fishkeeping are way more complicated as compared to freshwater fish keeping. There are wet and dry filters as well as protein skimmers in marine fish hobbies where the latter are basically used to remove any organic compounds which could be found before degradation happened. In aquariums practicing the Berlin method that very much uses live rocks, protein skimming too are very common.

Sumps are sometimes used where a water pump in the aquarium is connected to an external container which normally is placed below the tank. A refugium is also sometimes used which come in the form of either containers or small aquariums also placed beneath or behind the main aquarium and then connected to a water pump.

In terms of lighting, it could be slightly tricky as they are used not only for aesthetics purposes but also governs the day and night for the fishes. This is very important to them because it will slowly form a routine for the fishes so that they are aware of when to rest and when to be active. This is called regular cyclical lighting. Other types include Incandescent Lighting, Standard Fluorescent Lighting as well as Higher Output Fluorescent Lighting.