Question 2, water flow and designs for reef tanks

[Ruth]

Ya know I have thought about this quite a bit. On my 190g I have a closed loop that is powered by a sequence hammerhead and then through an OM 4 way. I also have 2 X Tunze 6200 on a controller and then of course my return pump for another 900 or so gph.
On my 230 I have a closed loop run with a Mag 24, 2 X Tunze 6100 on a controller and again my return pump for another 900 or so gph.
I don't think I have enough flow in the 230g for SPS but it is mostly softies anyway.
On the 190 - if I were to do it again I would skip the closed loop and just have my return and 4 X Tunze 6200's for flow. The flow of the Tunze - particularly run off of a controller IMO just can't be beat. I might even add a couple of tunze waveboxes to this setup to get the rolling water movement.
If and when I ever set up my 300g cube I am not going to do a closed loop. Just 4 or maybe 6 Tunze's.
I am probably going to re-do my 230g this winter and am going to suck out the DSB and put another couple of Tunze 6100's in there and may add a wavebox as well and turn this into a SPS tank. My green carpet anemone has snacked on all of my gobies so I just have to probably find a new home for my black cucumber and watch the 2 mandarins to make sure they are getting enough to eat.