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Get u an acclimation box and set it in your tank. Put the new wrasse in the box for a few days and observe if there's any aggresion
i have an acclimation box so I'll try that.
Your best bet would be to pull your two existing wrasses and have them hang in the sump for a while, or a seperate tank (QT tank maybe?). The new fish would at least have a chance to settle in without the existing fish pestering them, then you could try adding them back into the display later on. As Brad and a couple others mentioned, I think you'll have next to no success adding any other wrasses without pulling the established mystery and six line.

