I have two guppies who are together in about 1.5 gallon tank.ONe is female and the other is a male. The past couple of days, the female guppy is fighting the male. It is stressing him out so much that he was changing a different color. He wouldn't eat because she would eat all the food. He hides in a corner and tries not to go near her, but if he moves from that spot she attacks him. I seperated the for the time being and he seems to be doing better, but what do I do??? Do I put the other one back in??