I have a 155 gallon bow that I placed two very small yellow watchman gobies in over a year ago. Well i really don't know much about these fish and a recent "transformation" has caused me to seek more info. when i bought the gobies they were about 1.5" long and both had the classic yellow coloration. Now one is about 2" long and looks the same as when i bought them while the other (obviously a male) is now over 3" long. His head has become very large as I understand is typical for males. What I was unaware of (and am trying to find out if this is common) is that he has become pure white. He has light grey bands with blue spots on his back. he also has blue on the edge of his ventral fin. He looks REALLY neat (i'll try to get a pic this week) but i was just wondering if this is typical. Thanks!