dont know of link.
thanks for quoting that Greg, did not want to say it again
terry your thinking about it wrong. lets ask why not, instead of why
ok this might go into left field a little. say you do have fast flow through the sump/refugium. where would all nutrients end up? they dont stay floating around, they end up behind some rock or somewhere in the back of DT in areas low flow forms because of rock work or whatever. now other algaes, like micros, go to work on it in and grow in the DT.
mmmmm, ok no low flow spots because of rock anywhere, just say, the water is always moving fast everywhere and nothing settles anywhere(not going to happen but just say). so now the nutrients are spread all over evenly so algaes in the DT gets as much nutrients as the macros and skimmer do in the sump. thats not good we want the macros and skimmer to get more so the algae in the DT doesnt grow. fast moving currents suddenly slowed causes nasties to accumulate. we want to maximize the flow in the DT to prevent these areas, however, we do want this to happen in the skimmer and macro areas in the sump. so a sudden low flow in the sump causes a build up of nutrients where we want them
