i don't want to irritate anyone, as it can be a touchy subject in itself, but regarding the sand-sifting gobies... i'd recommend against them, as they almost always end up starving to death as captive sandbeds can very rarely support their nutrition needs. they are one of those fish that i wish importers would stop collecting. they are popular, no doubt, and sell, which is why they keep coming to us...but even in a huge (1200g) display tank with a dsb, i've witnessed an orange diamond goby whither and die over the course of about a year. :(
all you need are the nassarius imho.
Even beyond that, if you plan on keeping any coral on the sand forget it. They will cover them. I had a barred dragon goby for 2 years before I sold it and it was like a machine. It went back and forth over my 75 daily but would float at least half way up in the tank when it sifted it through its gills and just covered coral,clams and the base rock. I sold it when I got tired of blowing everything off two or three times a day. That thing would eat hair algae also by the mouth full. I will always have a dsb though, just love the look. Whenever I would feed the tank or the fish poop hit the sand, it never sat for more than 30 sec before the spaghetti worms pulled it under.
