I looked through a couple of images on google, and he doesn't got that dark blue color on his body, it's more like a light blue color. The tail doesn't have the dark edge either, so I don't know
He looks a bit better today, but he's still weak. He ate a couple of blood worms, brine shrimps and pellets today, that mate me happy. He is skinny, and seems to be a bit scared of the food, poor guy.