Around 3 months ago my female guppy had 30 or so fry. I could only save 2 and they are pretty big now. One isn't coloring up well as my betta recently (about 2 weeks ago) took a big chomp out of his tail. He's doing surprisingly well and its already started to grow back (dont worry the fish are separated, soon I will be rehoming the betta). His colors are the same as his brothers, but he has black dots on both sides. His brother has a black dot on one side and a black rectangle on his other side. Is this normal?