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Ok, from what I can find, the blue spot is also called the wheeler's goby (Amblyeleotris wheeleri). The only pic I could find looks like yours but the colors were way more intense. So, possibly. :?
The one I have is almost transparent. A little yellowy. Almost like the color of a glow in the dark sticker when in light with small blue spots. There are 4 bands on it but they are not very pronounced
Its defintly a watchmen, i have two that are breeding and the one i assume to be the male was at first yellow but has changed completly to look like the one in the picture.