I have 2 male bettas and 1 female betta. My male and female are in bowls side by side but I have a piece of cardboard in between so they won't see each other and she won't get stimulated. My other male is in another bowl in another room. I was wondering though can I put my 2 males together side by side? I thought this wasn't a good idea for males to see each other constantly because then they will get frustrated, is this true?