There are only two ways I would set up a saltwater tank. DSB or barebottom, in the display. I just feel barebottom is much easier to control. Unless your sump/fuge is as big or bigger than your display, it will be undersized and unable to handle the bioload of your tank. This goes for denitrification in a sump also.
Join the dark force Luke (Sabi) , go barebottom ! LOL
