I have a very serious agression problem in my tank of mollies. In total, there are 3 males and 1 female. One of the males (the biggest one) has turned extremely agressive towards his tank mates. He will constantly chase and bite them. One of the males is so exhausted and traumitized he is just sitting at the bottom of the tank, gasping and dying. I think he is trying to protect the 'his' female from the other males. Surprisingly, when I first got him, he was sooooo shy. That was when I had 4 females and 4 males. They have now died due to a disease in the tank which has now been treated. What should I do? I fear that both the smaller males will die of shock and exhoaustion. However, maybe that's not such a bad thing as then the agressive male will calm dow without any other males interfering with him and his missus! Please help.