I noticed that one of my traps has developed a black spot on the outside of it, and the trap is currently closed eating an ant. I looked at the top of it and it appears to be completely shut, so it's not like the bug is sticking out of it allowing bacteria to get in. This is one of my biggest, healthiest traps too. Is this a sign that the digestion isn't going too well with it? Does it mean it's going to die soon? Thanks