I know animals can have problems. It is almost common for people to hatch no-eyed or two-headed aquatic turtles.
I've been breeding animals for a LONG time. I know no animals are 'perfect'. There IS a such thing as 'normal', and without any noticeable problems. Reread all the last posts. All the people admitted that ALL spiders have problems. Not a 'potential' for having them, they DEFINITELY will.