I have a Syno. nigrita that got the crap kicked out of him by some N. brichardi that I had that decided to spawn. All of his fins were pretty much shredded all the way down to his body. Now, about 4 years later, he barely even has a scar and his fins are perfect (not to mention he's 3 times the size he was when it happened). I don't have any before pics though...