Yes. I read a story online of a woman buying a snowflake for her daughter and finding it in white chunks the next morning, flowing out of her filter. I checked inside of mine and there are white chunks of something....but I don't know if it could possibly be eel or just some other sort of build up that I haven't noticed until today. I spent the whole night searching, and he's gone.
I'm afraid that if he is in the tank somewhere that my ammonia levels are going to spike and then it'll put my baby porcupine puffer, Lucifer, in a horrible position. I think I'm going to do an immediate water change just in case....