Ok, so in my tank I originally had 1 male guppy and 1 female guppy they went through my cycle with me. The male was constantly picking on my female so I decided to get him 2 more females so he would possibly leave my mama fish alone. I also happened to get a fry with the 2 females I brought home. All are doing well but the male still sticks to the original big female like glue and will only chase her. Is this normal? Is it just because she is the biggest?