Being that I'm new to not only this forum but also the hobby, before asking for help I first wanted to give some information about my self, starting with my name: Thomas! As I grew up I always had a small plastic pond in my backyard that my father maintained and loved for year. When I was about 14, my father had about 5 koi he had kept for years, all of them were well over 20 inches long. While on vacation, our plastic pond blew over and we lost all the fish. Once I turned 16 and got my first job I started to restock the pond to see the smile on my dad's face he used to always have out in the backyard. That same year my father had a stroke, and my family and I were all devastated. Although everything came out to be alright, for that year's father's day I wanted to do something special for my dad. And since the second thing he loved the most(behind his family) was our pond, I decided I was going to take the little money I saved up and make him a new, custom built backyard ecosystem pond. With my shovel, wheel barrel, and the little knowledge I had; I started digging. I made my first ever pond by the end of 2016. Being that it was my first ever pond I loved it and thought it was perfect, but now having the knowledge I've gained(which isn't a lot) I know there was a lot I did wrong or could have done better. Next year I hope to make a bigger and better pond with over 5,000 gallons, but that's just planning as of now.
Here is my pond:
Below I have attached images of three different kois of mine that I hope you all wouldn't mind ID'ing for me. The first one I believe to be a Sanke, the second I believe to be a platinum Ogon(although it is still a very small fish), and the third is where I'm COMPLETELY confused. The fish seems to have no scales, and no color; as if you can see through it. I've searched through many websites and articles trying to find out what it could be, but I'm clueless. Please help me identify this!
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3) THE MYSTERIOUS FISH
Thanks for everything, and I'm sorry I don't have one of those fancy blue bowls to allow for clearer viewing.