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Depends on size of tank, you want good water movement an no dead spots if possible. I only use one brand now Koralia look them up online Dr foster and smith has great prices.65 in stores 35 from them.
They help with oxygen in the water brings a more natural feel for the fish and corals. Keeps the tank cleaner. You can change directions of them for the fish to exercise more. I putting a 700 in a 36 bow front with a 245 and I have 2 1050 in a 75 . Make them look more natural with clean water