Hi, I have 2 black mollies and 3 neons. They have been excellent fish. Today, I got 3 guppies. The 2 fancy guppies I had to buy in a pair, and they were all males. Then there was this very pretty bright orange guppie that I couldn't resist. I asked the lady if 3 males would all fight with each other. She said no. At first, they were all great buds hanging around together. Now, this evening, the orange one keeps chasing the 2 fancy ones. I was thinking that because the orange one doesn't have as big a tail as the others that it might be "tail envy" because he tries to nip at their tails, but was the lady wrong about fighting, or are they establishing their dominance, or is he just a bully, or what is going on? Please help. I really like these guppies, all 3 of them. I don't want the fancy ones to keep being harrassed to death all the time though, but the orange was is very pretty too. Also, one of the fancy ones seems to stay in the same spot now, not swimming all around the tank, just saying in one small spot all the time. Is that his "territory"?