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Rich.. you lost me.
A heat exchanger works better with a faster flow. The larger the Delta T, the more efficient the exchange...
Escobal and others have done some work with regards to skimming and turnover. In a nutshell the slower the feed rate, the better the performance. However if the feed rate is to slowthe skimmer can not keep up with the nutrient load of the tank.
In other words, slower feeds crreate cleaner output by removing the stubborn protiens but may not processes enough water fast enough to have a benefit on the tank more than a quicker feed rate that may leave the stubborn protiens.
So to answer the OPs question... slower is better. If the skimmer is oversized for the tank, then slower will not hurt, esp if it is a recirc skimmer. You'll be skimming a LOT of water even at a slow feed rate.
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