My 125 LPS/softie tank only has 15x turnover, any higher than that and my LPS start to get a little pushed around and my huge umbrella just retracts and leans to one side.....Flow is very depedent on the actual corals in the tank, IMO it's very subjective, whats the actual flow pattern? I'd rather have smaller, very random flows vs really strong flow thats focused in one area.
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I would actually have to agree that the prior post is a good starting point and those flow rates should work fine, again, it really depends on the actual corals and the design of the flow pattern...Maybe a little higher for FOWLR tanks...