The 635g is a maximum if it was not pumping anywhere. With 3 ft that is somewhat reduced. The max head means beyond that it will not be able to push any significant volume.
I had a 6025 in a 37g and it was great there. Although it is now in my 90 and doesn't seem like so much flow. And it is a little louder than the larger 6060 pump but not bad. Not sure how the niose compares to the hydors though.
More flow will definitely help keep the detrius in suspension till it is consumed or skimmed. someone else said its not too much flow until it disrupts your sandbed or blows something over.
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