If you saw it i would not worry at all, just give it time. While I do not think this will be the case with a wrasse, I have a goby that I have had for about a year and I have seen him maybe 10 times, in fact I was sure he was dead for months and then I moved tanks and there he was after I took all the rock out . Give it time, soon that wrasse will own that tank as most do.
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