DSB and Maximum benificial depth?

[noskimmer]

I have re-worked my sump a bit, put all the sand back in (about 40-50kg) and it is currently sitting at about 6-6.5 inches deep. I still have another 20 odd kg left (which could add about 2"), and the sand and LR from my old sump to go in (this will probably be about <1" worth). The sump is currently circulating in a closed loop till it reaches temp, and I test it thoroughly before plumbing into the display.

The question. Does anyone know at what depth a DSB becomes less efficient? What I mean is will another inch make much difference? or am I simply wasting sand?

[rockethippo]

Seems like a large sump. I don't know about DSB's, but theres this really cool sump design you might want to check out. http://www.reefvideos.com One video to the right from the video in the top left corner. If you decide to do this please let me know how it goes.

[noskimmer]

Very cool video! Now i'm starting to think of having a dark low flow zone!