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I have 6 fancy guppies and I have had them for a little over a month, recently I’ve noticed there tails seem damaged and that they are nipping at each other. I don’t understand why they would be doing this since they have plenty of room in their 10 gallon tank and they get plenty of food. I thought they were peaceful fish?? They are housed with two mollies but I have never seen the mollies harm them, or even notice they exist.