I bought two Neon Tetras to cycle a 5 gallon aquarium and they won't leave each other alone! They keep chasing and attacking each other. I don't know what to do...I know neons are suppose to be in larger groups, but I plan on moving these two into my larger aquarium with the others when the tank is cycled. I'm afraid that they are going to hurt each other. The aggressor seems to be a small female. What should I do?