madmac,
I am running a sandbed. I plan to keep a 2" sandbed in the front and 4" sandbed at the back of the tank in the new setup.
I think a team of effective cleaning crews has a critical effect in cleaning up the detritus. I don't have a great problem on detritus.
Your setup is pretty close to my planned setup. With the stream flows meet at the top center of the tank which is on top of the rockwork. In this case, the SPS's will receive maximum amount of flow.
I intend to put the streams at the back of the tank due to space issue. Do you have a full tank picture of your tank? I want to get a better feeling of how the streams occupied the view in your setup.
Thanks in advance!