one of my sens bichir is swimming in a funny way, when i took a closer look i noticed that one of his fins below the head was nipped!! the only part remaining was the bone outline or something. will it grow back? and what can i do to help it grow back? my sen is still young only 3 inches, its housed with another 3 inch bichir and a 3inch BGK. can anybody give me some advice? i would really appreciate it 