Ok I just got my second Ghost fish both are 30cm long and I was told they originaly came from the same tank, they were put into a smaller tank and needed to be kept apart because of the smaller tank. I got the first one about 3 weeks ago and now got the second one. These two just keep going for each other it has now been two hours, they seem to bite but do no damage. Is this just teritorial and will they sort it out or should I get rid of one. My tank is about 756 liters.