Rhaphidophora tetrasperma is only distantly related to Monstera and Philodendron. It is from almost the other side of the world in SW asia, the others are from central and south america. Grow it in a good moist but not wet loose fast draining grow mix, Something like 50% - 60% shredded bark or pumice, with the rest equal parts peat and compost with a little charcoal tossed in, mix it all well and don't pack it down into the pot. Alot of folks here would recommend Turface but I've never used it so I can't give an opinion of it but I've been in the research greenhouses at MOBOT in St. Louis and they use a similar mix there and some of the plants grow in it for years. Than give it something to climb cuz it'll want to climb if you give it good growing conditions. By giving it a pole to climb it will attach its roots to that rather than something like a table leg or the molding around your windows. If you get roots that just stick out in the air you can either guide them as they get longer back into the potting mix to aid in feeding the upper portions of the plant, leave them to hang loosely or just cut them off. Ideally, humidity should be on the higher end of things but like most house plants it should be able to adapt somewhat to home conditions, Just don't let it dry out. I have for the last couple of years ran a humidifier and it makes a huge difference to both my plants and how I feel during the winter. Check out the link below for more info, it is not my site or a commercial site. Here is a link that might be useful: Rhaphidophora tetrasperma

Subtle changes in the plant's chemistry or cultural influences can conspicuously change the way light is reflected from the surface of foliage, even to the degree the entire leaf can appear to have changed color. I won't agree or disagree with the idea that watering habits is having an effect on how light is reflected because I don't know; but, the fact you can detect a color break in a plant well-known to be chemically manipulated during tissue culture in order to achieve that effect is a pretty darn good reason to think the underlying reason for the variegation was an intentional act. Another way to look at it is, had the plant not been treated in its embryonic stages to achieve the appearance of chimeral variegation, you would not have noticed a color break. Al

I water only when dry, so once a week in the summer because it was getting a lot of light, and now I’m watering every 2 weeks. I haven’t checked the roots because there is another RT in the same pot that is super tall, so I don’t want to mess with the root just in case I might break some things.

You may need to change the location .My plant did the same and stays dry , I had it for years and never did this . Get a long stick or paint stirrer and use it to keep checking for dryness in the bottom of the soil . It was better outside last summer and in another room. I plan on putting it outside on the porch . If it grows back larger , then I'll know it needs another location (room ). For the winter.