I've had this green cabbage leather for a few months. It developed 2 holes in the middle. Now one of the holes is covered over in rust color. I dipped it in coral rx last week and for 1 day I couldn't see the rust color anymore, however it came back. Any idea what this is and how I can help the coral? I also found a type of worm thing under it when I dipped it. I cut it out. Pics attached






