Okay so I haves a thaumatophyllum that seems to be getting mushy leaves. Almost as if they had water blisters inside. I can't seem to find anything in google that could explain this. I got this guy not too long ago. The soil it came in was extremely mushy, and it just didn't look good. so I completely removed all of the soil, washed out the roots gently and transferred into a very well draining Aroid mix. It has grown quite a bit since I got it. The leaves to seem to "sweat" quite a bit over night. So perhaps it's an over watering thing.
Here are some pictures: