Hi T1,
nice pup!
What is the diameter of this pup now?
And is it still feeding on pellets?
There was one pup with many very small spots breed by David Hinz:
http://www.perlenrochen.com/Bilder%20Rochen/P14/p14.jpg
In the picture of your pup it look like the large spots will split.
If I'm right with the lineage of your rays this is the grandma. She had the nickname "douple dot":
http://www.perlenrochen.potamotrygon.de/p14-verschiedene-2.jpg
@Alex
You asked me if your ray is a galaxy.
The one in the pictures you show here is a galaxy.