Canary/Yellows Halichoeres chrysus have a reputation for picking on new wrasses added after them. Kick the six-line, then be VERY careful adding the melanuras. Get a bigger Melanuras than your chrysus.
Incidently, Melanuras and Yellows are great wrasses. I have both, and they peacefully co-exist with 2 other wrasse. Just got to be careful at the beginning.
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