how big of a tank and what kind of flow do you want?
What fish are you keeping?
You may also want to consider tunze, because they produce more direct flow than vortech. My tangs love tunze and will swim directly at the powerhead. Both are great products.
i have one in a 60x30x23 barebottom. it works out great for me since i can crank it up all the way and not worry about stirring up a sandstorm. most of the time i keep it at about 50% though.
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