You're talking about a QT tank. You shouldn't need that much flow. QT doesn't need to be set up for "ideal" growing conditions. I'd think between 5 and 10x would be fine. If you plan to use the QT for fish as well and it is small (10 to 20 gallons), don't go overboard on the flow because it could stress out the fish in such a small tank -- something you are trying to avoid with QT.
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