Tom,
How often are you feeding the BBS? I don't think you are feeding them enough BBS. If the parents are showing signs over grazing and theres that small a number of fry try feeding more BBS or more often. Its possible the male is more aggressive at attracting the fry or not making as much slime as the female. The females color looks good , like its making alot of slime. Its not uncommon for some minor wear and tear during feeding..but be sure to feed enough BBS. They are eating it, as you can some pink in them. Other than that, they look nice and uniform.
Do they fight over the fry?
al