Your telescope is just a two-colored telescope. Not a Panda.
A Panda moor should be white with black markings on the eyes, fins and back only, otherwise it's not a real panda moor.
Next, they can have all the other colors as the rest of the goldfish, and I already described/explained that in another thread. -> (Link is not visible to guests. Please register to view.
Your average telescope could reach 6 inches (maybe a bit more) if he got enough food while he was little
(and of course, provided that you feed him lots of protein and vegetables aside from the pellets.) Don't give him flakes, goldfish have such big mouths that flakes really aren't suitable as a staple diet. I keep telling this to people, seeing as all the goldfish I've seen eating flakes are having a much harder time with that than pellets. Get 2-3 different kinds of pellets for the little moor, one could be sinking, they just love that
Aside from that, live foods = Blood worms, brine shrimp, krill, tubifex, gammarus... should be a regular part of his diet, feed him this a few times a week
Vegetables, same thing, frozen peas (that you thaw and popo out of their shells), zucchini, lettuce, water melon, cucumber, spinach... it's usually a good idea to blanch these foods to make them softer and easier to eat