Answer: Let's see if we can shed a little light on the subject: Pachira aquatica is commonly called water chestnut, Guiana chestnut, Malabar chestnut, money tree, and saba nut. In the wild, Pachira aquatica is a wetland tree that grows in freshwater swamps associated with tropical estuaries. It often grows alongside rivers, where its branches arch out over the water. Pachira aquatica prefers a site that is flooded much of the time and may develop stilt roots under such conditions. Like most swamp trees, it is likely to grow faster if planted where the water will recede and let the roots get some oxygen now and then.
Now that you know a little more about your plant, you can understand that a drainage hole in the bottom of the pot will be helpful, but it is not absolutely necessary at this point in the plant's life. When you get around to repotting, you can choose a new pot with drainage. At this point, simply water your plant by immersing the pot in a larger container of water until the soil is thoroughly saturated. Allow it to soak for about 15 minutes and then pour off any excess water by tipping the pot slightly. You can allow the top of the soil to begin to look dry before thoroughly watering again. As for the soft spot and the withering of one stem, I'd take a wait and see attitude. It could be that you've been so careful with watering that air pockets have formed within the root mass of the plant and that single stem is not getting the moisture it craves. Water as described above and see if the stem doesn't plump up in a few weeks. If so, great - if not, I'd allow it to die back on its own and then carefully cut it away from the rest of the braid. Since your Pachira loves growing in water, it shouldn't develop the root rot that so many other plants are prone to.
Continuous production of new foliage is good. It means your plant is getting the right exposure to light and is responding to favorable indoor temperatures.
Hope this answers all your questions. If not, feel free to drop by again.
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