10-05-2009, 09:53 AM
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I've done a little research on filter flow rates and most of what I have observed both keeping and selling fish indicates that most "community" fish can handle flow rates as high as 7.5 cycles per hour (gph (US) divided by the aquarium size (US gal.)). That includes even semi-delicate fish like angelfish and black-water tetras.
Personally, I use filter that rely on residual flow. Consequently, the turnover of my systems is always high. For most of my tanks, the turnover is between twelve and 20 cycles per hour. Despite the turnover being so high, it has not caused any significant problems. In fact, I have had less problems with desease (no diseases for a few years now) and less maintenance issues.