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depends on the rockwork and the depth of sand.  If your rockwork was quite open, say, for a fish only tank, a 6060 might be too much.  However, I think that with a reasonable amount of rock, or careful placement of rocks to disperse the flow of the powerhead, you should be fine.   You might even consider getting a 6000 which can be dialed down a bit if it creates too much of a  mess.  The 6060 is not controllable in that manner.