Honestly no idea. Google image search would like to suggest it may be a planet, a jelly fish, or a chicken marinade. I would not take it's word on it. "Axolotl Pink Blob" also only finds images of axolotls.
Sorry, all joking aside, I wish I had an answer for you, but I thought it might be good to at least let you know people are reading your question and looking for results.
Do you by chance feed pellets? I looks like a mass growing fungus\mold.