Help to identify - Gobi?

[Resantlie I have purchased a new fish. It does look a little unusual. Judging by the head shape and hobbits it is some kind of Gobi but it’s body shaped like an eel.
Can anyone help to identify this?
:idea:]
 
[It is a very shy fish and intends to hide most of the time. I took a few pictures with my digital camera. How do I post them?]
 
[It can be prudent to know the fish before you buy them and put them in your tank. Some fish can not live together, others are impossible to feed. Yet others can not be kept in a reef tank, since they can be a detriment to corals. After you buy them and you have problems it can be nearly impossible to get them out of tanks with liverock in them. And you can not take the word of some lfs employee saying, "oh yeah you can keep two Yellow Tangs together".]
 
@Rick wrote:
[It can be prudent to know the fish before you buy them and put them in your tank. Some fish can not live together said:
[GREAT POINT!! We must all try to be responcable reefkeepers...]
 
[Thanks, for help.
This fish is engineer goby indeed. The colors and bends are a little different than usual that what brought my question.
I am taking this hobby for 20 years, but it is always a pleasure to meet a responsible reef keeper.]
 
[I, too, have an engineer goby. A word of warning - watch your rock work! The engineer digs under, and your rocks will definetly fall over, if not either sitting on the glass bottom, or sitting on pvc - something that cannot shift and is on the bottom. Also, they spit sand all over, though usually in a pile. If you have a clam on the bottom, he will get covered in sand.]
 
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