6 line wrasse and 4 line wrasse

[kien]

I few years ago I had two six lines together in a 90g tank. Both were bought together. They loved each other and swam together all the time, never bothered anyone.

Fast forward to today, put a 1 sixline in my current tank first, then about a month later put a second one in. The first one quickly harassed and killed the second sixline before I could get him out He does not bother anyone else though.