Yup. I have mine on 3' 65g tanks and that's probably the min. size I would personally go with for this size/power of Seio. In an sps dominated reef tank, the corals might enjoy the high flow, but clowns are poor swimmers & anemones often don't fully open in high flow & a 30g cube is too short a distance for the stream to disperse enough IMO & IME.
Anthony
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