Chamaedorea affliction identification?

[_woods]

Chamaedorea cataractarum. Indoors, west facing window, direct sun for most of the afternoon (upper midwest US, so not overly intense, no leaf burning). In a well-draining mix of FF Ocean Forest, coir, and pumice. Gets dechlorinated tap water once a week or as needed. 

leaning towards fungal, wanted to check here before pursuing treatment options (banrot)

The afflicted areas are hard to the touch, and do not foam when in contact with 3% hydrogen peroxide. 

[happypalms]

It looks like to much moisture, you need more air flow and let things dry out a little. It’s definitely a fungal situation and by the looks of all that water on the stems that’s part of the problem. 

[_woods]

It had crossed my mind when I'd posted the photos that they might give a false impression of the conditions the plant is in. I'd just hit it with peroxide to test the lesions for reactivity, which is what you're seeing here in the photos. In reality the humidity tends to average on the lower side of 50%, along with a small fan continuously circulating air around the plant.
I will keep moisture in mind though. I appreciate the response.

[peachy]

Retailers shove a dozen or more seedlings in a pot to make them look like a large clump.  Maybe if you separate the individual plants and repot them, they might be able to breathe a bit and there will be less root competition too.

Peachy