Ok...about six months ago, my ex boyfriend bought me a fish from a reputable fish dealer. When we bought it, the guy called it a yellow tailed BLUE damsel. After a few days, I began questioning after seeing pictures of the yellow tailed blue damsel. Mine appeared a dark purple almost black color with a brilliant yellow tail with like extensions to the tail fin. I looked everwhere and could night find a picture of one that looked even similar to my fish. I have asked around and they suggested a BLACK yellow tail damsel. could that be what I have. He is about two inches long, maybe a little smaller and he is a bully to my tomato clown and used to be to my snowflake eel. I don't know what to consider him...I think he's a black yellow tail, but I'm not 100% ???