I recently put two male Dwarf Gourami in my tank and this may have been a mistake as one has proved to be dominant and endlessly chases the other around the tank. The dominant one has also built a bubble nest and simply will not allow the other near any part of the top of the tank. In fairness both are eating well as the other stands up for himself at feeding times. My question is should I take one out? (I know no damage is being done physically as they are not great fin nippers)