I've recently lost my 6 guppies from my tank so I decided to replace them with 6 more. I have a siamese fighter fish in my tank that is ridiculously chilled. Never had any issues with him before. My guppies/Corys/Betta and pleco all got along brilliant without any troubles at all. So yesterday I introduced 6 new guppies into my tank, 2 male, 4 female. They are petrified of the Betta. They literally stay at the surface (not gasping for air) and when he goes near them, they frantically swim away. As I said, the Betta isnt aggressive at all, its purely the size of him which is scaring them. Will they eventually settle and realise hes not a threat, or is there any way I can help them adjust to the tank? Its worth pointing out, that my original guppies were in my tank before the betta. Whether this makes a difference or not, I'm not sure?