I would keep an eye out because they multiply fast. And before you know it they will be all in your tank. The first time I seen them in my tank I thought it just some fish waste on sand bed. Then I realized I had alot. They come out more when lights are on too.Thanks everyone. I’ve only seen one so far. Been staking the tank out and haven’t found another one. I love 6 line wrasses and my LFS has lots of them for cheap. Should I adopt one?