I've also had a number of fish dissapear on me too. I actually found out that a few of them dissapeared because of an anemone in my tank that would eat smaller fish whole. My boyfriend witnessed this two times. The fish were weak though and unable to swim out. I also have a large pistol shrimp in my tank who is usually peaceful, but if there is food (even that being a large piece such as a dead fish) he will come out and snatch it, bringing it into his hole underneath the live rock. The wrasse might have been weak or sick or something and gotten too close to some little creature in the tank, and got himself snatched up for dinner.
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Krissy - student, ecology/biology major, loves nature! 
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