on the very tip of my male snow corn he has a little red spot that has been there the whole time i have had him, he is almost 7 months old now and i have had him 3 of the 7 months and it has been there the whole time. is this for breeding/fighting? i realy dont know and i am getting kinda worried. it is the very very end of his tail and i just don't know what it is, please tell me. Thank You.