This a new setup besides the most of the rock coral, etc that came out of my old tank so the coralline hasn't had a chance to grow on the glass yet..i actually can start seeing of the coralline starting to spot on the glass now...With my last setup I over crowded it and was not able to clean alot of the glass on the sides and glass...So, this time I decided to limit the rock and keep it off the sides and even some of the back to allow me to clean the glass almost all around. To scrap the glass when it does get coralline on it I use the Kent glass scraper that you can get at most LFS.
As far as the DSB it's not really as deep as it looks..The flow has some of it piled up..It's only about 3". From what I understand you should atleast stir up the only 1" in or so once a week. This is helps with bad bacteria building up.
This is more of an experience to me to see what how it works. We have a LFS that does this and there sand is always white.. But I have found in this hobby what works for some people the same thing may not work for other people.. I will know more in the longterm if my sand stays clean and white...
To keep from sucking up the sand. I just take a regular aquarium siphon hose (the one that has one big end and a hose connected to it). I place the big end into the sand until I see the sand starting to go higher in the tube and when it does this I just kink the hose to stop the siphon and the sand just falls back into the SB. You may suck a little sand out but once you get the hang of it you shouldn't have a problem..
Sand sifting gobies can do a pretty decent job but as some people know they can drop pieces of sand on your lower corals, brains, zoo's, ect...
HTH
Chris