Well, what do you mean by not much light... maybe not full sun, but it will need some light. When you water, is the soil totally dry? The water may be running down the dry soil on the outside of the soil between the pot and soil OR there is no drainage and that's too much water and it's rotting. Those are my two guesses.

I wouldn't eat it.

Don't be offended, but the "Guaranteed analysis" of:Total Nitrogen (N) 0.01%, Water Soluble Nitrogen Soluble Potash (K20) 0.01%, Calcium (Ca) 2% puts the product high in the upper tier of products least likely to benefit your plant or help you succeed. It contains essentially nothing (1/10 0f 1 % nitrogen and potassium oxide is a miniscule amount) in the way of nutrients other than a little calcium, that if applied without including an appropriate amount of magnesium can induce an antagonistic magnesium deficiency. People have various views about how and when to fertilize because (easily) 99% of hobby growers have no idea how to take and keep control of nutrient management for their plants. What you fertilize with is important. It's essential that plants have all nutrients they normally take from the soil in the soil and available for uptake at all times. Most fertilizers don't allow you to accomplish that without using other products to supplement the primary source of nutrients. That's a headache and often doesn't end well. Also, your soil choice and watering habits are primary considerations in determining when it's appropriate to fertilize. E.g., if you're using a water retentive soil and are watering in sips, it might not be appropriate to fertilize AT ALL, from the period from mid fall through mid spring for fear the level of salts in the soil will rise to concentrations so high it makes it hard for the plant to take up water; but, if you use a highly aerated, fast draining soil that you're flushing every time you water, it's entirely appropriate to fertilize at low concentrations every time you water, which is what I do. I use Foliage-Pro 9-3-6 because it has all the essential nutrients plants normally get from the soil, in the ratio at which the average plant actually USES the nutrients. This is a significant advantage because it helps prevent the badly skewed concentrations of nutrients that end up in your soil when using fertilizers that provide nutrients in a ratio not even close to that at which they are actually used. It's simple and has all plants need for normal growth in one solution. Al

The top of the main stem would normally have calloused over after first cut without any problems. But the wax would be an added safety measure to keep it infection free. Removing it now wouldn't help the plant. New shoots will always come from the side of the stem so the wax won't affect it, unless it's down the sides as well. So I'd agree about leaving the wax in place.