The gobies continue to make a remarkable difference to the overall look of the tank. My entire sand bed is now perfectly clean and tossed, all the time. The down side is that the water column is not as clear as before. There is always some very fine sediment being kicked up by the gobies somewhere. I'm hoping it clears out eventually, but I can live with it if it doesn't.
Twice now, the gobies (Bonnie and Clyde) have piled up the gravel so high that it starts to cover some corals on the lower rocks. They have smothered a couple of corals and some have had some die back.
Bonnie (the smaller one) gave us a bit of a scare recently when she disappeared for nearly 3 days. From what I've read, this might be consistent with breeding behaviour. It is possible that she would have disappeared for longer if her health had been enough to sustain her in her burrow. As is, it may have been a practice run.
Enough words...here's some pictures!
The Atlantic Blue Tang is really striking colour. It is really hard to describe, but I've come close to capturing it with this picture.
The dynamic digging duo....
Pitstop at the cleaning station...

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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank:
http://www.canreef.com/vbulletin/showthread.php?t=28436