I have had a sixline for several months and I love it. It has a great personality, weaves in and out of the rock work. I have never seen it be aggressive, playful yes, it likes to play tag with my royal gramma and it gets in on the tug of war over the nori strip with the yellow tang and the coral beauty. I think it is a great community fish and I know that lots on this board agree. I've never heard of one attacking a shrimp. Mine will try to "clean" other fish sometimes and the tomato clown actually likes to be cleaned by the sixline. I recommend them highly for a community tank. IMO/E