I had a Yellow Watchman Goby that turned gray and never colored up again. Very happy fish, just lost its color and never got it back? Reeferrob has had it in his grow out tank for almost a year with no changes in color?
I have a Tailspot also, they have stripes when they sleep. They'll turn white out of fear also. I had mine do this once when I was transferring him to a different tank. The Ecsenius genus is known as being color changers.
If you are interested in learning about reefkeeping or have a problem with your reef, our reefkeeping community is here to help. Feel free to ask a question or search our site. We have lots of experienced reefkeepers that are willing to provide free reefkeeping advice!
Besides being a great resource for all levels of reef aquarium hobbyists, CaptiveReefs is a social experience that will enhance your enjoyment of reefkeeping. CaptiveReefs is committed to connecting reefkeepers with the support and information they need to grow beautiful coral reef aquariums.