I was taking pictures of a golden fry that has shown up in my mom's guppy tank when I noticed a guppy that looks like it has clear spikes growing out of it, for lack of a better word. There are quite a few of them, and they look almost like crystal formations or something. To be quite honest it looks like something out of a horror movie.
I've attached a picture, but its quite hard to see because he hangs out in the fry corner with all the rest of them. It's easier to see in the reflection. Does anyone know what this could be? None of the other fish have anything like it on them.