I would not use the sponge myself, its designed to be a bio filter but live rock does that just fine for me. I have used them i my nano cube and on CA and Maxi-jet power heads. As long as you get them attached tightly, they are fine. As I recall they come with several adapter pieces to fit onto different types of power heads.
Sure, if you can match up the tubing you are good to go. I've been happy with them, they are not fancy and the gears have to be cleaned every week or so but they are reasonably priced.
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