what a trippy fish

That is a green mandarin goby (or dragonet). I have a couple, they're terrific additions to your tank, provided you have lots of well established live rock and sand loaded with copepods. usually can find em for about $20
 
I have one of those. Her name is Mandy. They do not do well in new tanks. Tank needs to be established for several months before you add one. Most end up starving to death in new tanks.
 
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