I thought mine was real peaceful, until I added a barletts anthias to the tank. He chased the poor thing down, and beat the living crap out the poor guy. The barletts has found a way to get into the overflow area, and has been removed for the third time back to display. Yep, he was in there again, so owell, let it go until I find the little guy a new home. Other than that, I love my six-line, and he would stay in the tank regardless. They are so cool to watch, and have great personality.
Good luck playa...