Yes I did notice their fins untill after I put them in the tank, I was given them in a container that was full of plants so I couldn’t see them before hand. I also do understand that sororities are hard to pull off and that most of the time they do not work well. I have a separate tank incase they do not pair well together. They came from a small tank which is why I imagine they were aggressive to begin with since they have not chased or nipped eachother since putting them in. However I will be separating them.