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In general....cold water stuff doesn't need near the flow that we provide in our sps tanks......the strawberry anemones do need a bit of flow, though....but, nothing compared to an sps tank. I have a single Tunze Stream (dialed down) in each of my two cold tanks for flow....plus the sump return, of course.
You know.....there's not that much info out there on cold systems.....it's a chicken and egg kind of thing....there's no info/stock for cold tanks because no one has a cold tank.....AND....no one has a cold tank because there's no info or stock. But, it has been done for many years....just not to the point of commercial success like warm tanks. The wholesaler in Tasmania had no problem selling to me....they mostly sell to just universities and public aquariums. I think I was their first hobbiest.
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