I have a 20 gallon waterbox with 2 clowns 1 watchman goby and a aptasia eating file fish. (that actually ate the aptasia and hopefully wont turn but I am watching) My family love wrasses and I know in a tank this size I have limited options. I am leaning towards a pink streak but they seem to be impossible to find. I am not comfortable ordering from divers den I have seen one pop up there before. So to my question are sixline that bad it will be the last fish added to the tank. How much of a risk is it to my other fish that my family is attached too. As in if they get murdered by another fish not a happy household. Thank you for the insight!