www.ratguide.com look up megacolon

I'd find one or two more females to raise up and just use the high whites as buddies for the grow-out babies. Breeding them could result in babies that aren't able to grow and thrive, which isn't good for the snakes either.

High white markings are patterns, not colors. Rats with blazes(marks on their faces), have a greater chance of carrying bad genes because alot of inbreeding has occured to create the "pretty" markings.

It's best to use rats that are hooded, self(one color), berkshire(white feet and tummy), irish(white on chest).