I dont know who did it. I have 5 3in bleheri and 1 3in redline in a 55 (till i divide my 150) One of my bleheris tail has a chunk out of it. I am not sure who is the attackee as i watched for a good half hour and found nothing. All the other ones are fine, no wounds or anything. How should i treat it. Ps he is swimming etc fine. Thanks