Minimum of 2 x 6000's or 6101's I also have 2 6000 and a 6055 Nano in my 120. The Nano will be great for a smaller tank but doesn't come close to the 6000 on the size of the stream produced. If sand is an issue, point one down the back of the tank and the other at the front glass. It gives a random circular flow to the tank.
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