I've found golden head sleeper gobies much easier to maintain than the diamond watchman or orange spotted gobies, and they do a nice job of working the sand bed... but if you've got any LPS directly on the sandbed they might get covered a bit... I have a really big chalice that I had to put on a rock to keep it from getting too much sand scatter from the goby. My cleaner crew (125 gal tank) is 75 blue legged hermits, 25 red legged hermits, 50 turbo snails, 75 nassarius snails, two tiger tail sea cucumbers, and the golden head sleeper goby. They take care of algae and detritus very well. I'm a big fan of a full cleaner crew... if you've got detritus problems or algal problems and you don't have a cleaner crew, you're really not helping matters any.