I must be less sensitive to background noise than most people (which is strange because I am an audiophile) yet I don't find it noisy at all, although sump is in the basement so pump noise is not critical - always liked the PanWorld pumps, they have been very reliable for me (run them on all my tanks). I also don't find the Vortech pumps to be noisy, and they drive some people nuts it seems.
In tank circulation is an interesting question. Right now in my 265 I have a pair of Vortech MP-40's at either end of the tank, a Sicce Voyager along the back (forget which model; not one of the bigger ones though), and a closed loop (Panworld 50) with an OceansMotions device. We'll see, but I am already thinking it's probably not enough and that one of the MP40s might need to be switched to a 60; although I am tempted to try one of those Chinese Tunze knock-offs ...
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