Do mature (dark type) oscars eventually lose their white edging? My guy is around 11" and the white margin on his bottom half is now much thinner than it used to be. This makes sense, since he isn't laying down as much new finnage every day. But his dorsal and top half of the caudal fin still have considerable margins. Now, I know he isn't growing faster on the top than on the bottom, but what ultimately becomes of these margins? Do very old (10yrs.+) still exhibit any signs of this halo or is it too narrow to see?
