my venus fly trap was eating a fly and a lady bug a while ago and it was eating them for about 10-12 days. all of the sudden they started turning black, kind of like the were molding. it only developed in the area where the bugs were at first and then started spreading fairly rapidly to the rest of the head. thinking that it was going to spread to the rest of the plant i cut the two heads off. when i opened them up the bugs were mostly digested. were they just digesting them or do they have something wrong with them?