Best way to know if your fish are working hard is to look at their tails......if they use their tails lots, then they are working hard.......Ive got 10000 gph inside a 110g display and the only fish that I have that seems to have trouble with the flow is my clowns (but they aren't the best swimmers to begin with)......IMO anything we do for flow inside our little glass boxes pales in comparison to what mother nature can put across a reef
And Leah......I can think of funner things to do when Im bored
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa).
http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here
http://www.vimeo.com/2304609 and here
http://www.vimeo.com/16591694