This is my first clutch, laid around 5/14 so coming up on a month old. I'm using the substrateless incubation method, and followed the directions on the WOBP site (Perlite with enough water that it started to collect on the bottom of the tub, a light diffuser separating the eggs from the substrate, and press-n-seal between the eggs and lid of the container). The incubator is set at 88F.

All of the eggs candled well when I put them in. This egg wasn't attached to the rest, but was still coiled with them. The eggs seem to look a bit deflated, though not dented like ready-to-hatch eggs.

This one in particular has started turning colors on me. I can't tell if it's mold forming or just going bad. I sprayed a bit more water in the tub a few days ago, in case they were dehydrated, and I did not notice a smell. I didn't stick my nose into the tub either, so it's possible any odors are subtle at this point. Aside from briefly adding a bit of water, I've only opened the incubator door once to add my second clutch, and haven't touched any of the eggs themselves since they went in. A second egg in this clutch has a couple purple/green splotches on it, but they aren't big.

What do you guys think the issue is? A bad egg is a bad egg, and since it isn't attached to the others it's not a huge deal. But if there's a husbandry issue I want to correct it so I don't lose the rest of this clutch or the second one that was added on 6/1.