Following up from an earlier question from a forum member. My 4 year old wolf fish has a dark red knot on the end of its tail about 8mm long and 4 mm wide and 4mm deep. Several red streaks are working up the tail to its main body. It has been growing over the last month. Fish seems to have lost its appetite. I will try and add a photo if I can get a good shot. Is there any hope?

