Thats good wat. Your 2 shrimps are doing a good job. I got 2 cleaner, 1 fire, 1 black sea cucumber, 1 goby, sea urchin, lots of snails and my sand bed still very dirty. All they do is relax under the rocks and wait for food!
The cleaner shrimps are really good addition then. Always give a thorough cleaning to any new fish introduced. Also give my hands a good cleaning whenever I'm working within the tank!
I just got a goby yesterday... its all white in colour. This morning found that the two corners of my tank has been cleaned. Hope it cleans the rest of the sand bed by the time i go home today!
I'm not sure wat snails I've got (about 4) but all they do is crawl around the glass and rocks. Read the thread on sand sifters. Will try them and also the cuke.