Not sure what Frank has him preserved in, I just used rubbing alcohol to preserve it for a week. It passed away during a heater malfunction which rose the tank temperature up to over a 100 degrees. I then asked Frank if he would like the fish because it is still a juvi-adult irritan. Ended up sending it to him after the holidays.
It was a great fish, was very aggressive and my second favorite piranha. Only one I like more is my Geryi, this irritan though had a great personality for being such a small fish.
One thing that doesn't show well cause its gone now was the yellow coloring on his anal fin, but you can kinda notice it in the second picture. On the picture you have to look on the fin close to the body, when he was alive the yellow on the fin was great.