I recently got a weird looking egg from one of my button quail hens. It's blotchy in color, and I thought at first it was dusty. I tried to wipe it off, but the blueish whitish color remained. Her eggs are usually the reddish tan color you can see between the blotches in the picture. Does this indicate any disease? I keep my quail indoors and in 20 gal vented aquariums. They do have access to oyster she'll at their choosing.