You started a thread with a title that bashed a highly regarded filter system and you didn't expect people to respond to that? Bottom line is people are going to like what they like, for the reasons that they decide are justifiable and they will stick with it. In my opinion, the FX5 is a pretty good overall value, plain and simple. Poking at people for what they believe always incites a negative response. If you want to start a disussion, you have to begin with a clear and define topic to discuss and support that topic with facts, not a negative comment with no factual basis behind it.
Why do you have such an issue with the fact that I am a mod? Can I not participate and contribute to a discussion? I was merely trying to understand your point in this thread. What I am to gather is that you are simply questioning whether or not you have set it up correctly becaus you are not seeing the results that others are seeing, correct?
You are correct, that excess water flow could potentially impact the biofiltration of a filter system, but not to the point of making it ineffective. I go back to my prevous statement of how many people overdo the amount of bio filtration that they really need. This is most likely because there is no hard set number on deciding whether it is adequate or not.
In reference to the setup of the FX5, I have it setup just as the manual states, 6 foam pads and ceramic media/scrubbies, minus the polishing cloth. I ran two on my 265, with the outputs towards the center and the inputs towards the ends of the tank. No, the tank doesn't stay crystal clear, but it does stay pretty darn clean. Nothing a little tank maintenance can't take care of. For maintentance, I cleaned out one filter completely every six months or so.