Roy,
GSP can handle plenty of flow. It is not like you need 100 times turnover in order to stop detritus from settling. I have 1 vortech mp10 running at 50% in my 28g nano. No issues whatsoever with detritus settling in the front of the tank. On some of the sides under the rocks, sure. That is why I siphon it out every time I do a water change.
Putting GSP in the tank is a risk when it comes to spreading, but not if you keep on top of it. If you see it starting to spread where you dont want it, take a razor blade to the mat and move it somewhere else, toss it, or donate it to another reefer.
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Kevin
Current Tank Info: Waterbox 50g, Tunze 9004 dc skimmer, Vortech mp10, Kessil ap700
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