Yellowing leaves is sometimes a sign of stress. As long as the stem looks health and there are still newer green leaves, I wouldn't worry too much. You can layer (bury under soil) low lying sections of the stem so that those area root and the plant can get more nutrients.

HA! During WWI, for the war effort, my great great great grandmother would get permission to cordon off short sections of paved streets, on which she scattered rubber bands of varying diameter. Under her miraculous care, within days the rubber bands grew into trees so laden with tires for various types of military vehicles that often she and the neighbors couldn't harvest them all before they became larger than intended; this, necessitating that they be trimmed back to a usable size. She would then have the trimmings ground into powder, which she mixed with white milk. When the slurry of rubber and milk was heated under pressure in small molds (like sinker molds or toy soldier molds, if you've ever made either from lead), the result was Ficus elastica seeds which were sold to tree farmers all over the world and served as the propagules for essentially every rubber tree plantation currently in existence. I sure do miss that lovely and determined old gal. ....... at her 100th in 1966: She sure was something. Sad that we have to wait until next summer to see her again. Michelin has kept her so busy at headquarters in Clermont-Ferrand, France for the last 49 years, she hasn't been able to get back to the states to see ANY of her great, great, great, great grandchildren. Fortunately for us, her employer is picking up all expenses and footing the bill for her bash back in the states. Keep your eyes peeled for pictures. Al

What'd the farmer say when his horse died? "Hmmm .... never did THAT before." ;o) As a first step, I would remove the fertilizer sticks & flush the soil thoroughly & repeatedly. Then I would let the plant dry down to a normal moisture level and be careful about watering correctly forever after. W/o more dialog, if I had to make a guess at where you stand based on only the odds, I'd guess the problem is caused by a high level of soluble salts that have accumulated in the soil, and the plant is badly in need of a repot, which includes a change of soil to something fresh and appropriate - not just topping off or potting up. Al

Well it's currently in a hanging basket by a window so I wanted to keep that, but maybe get a slightly larger pot, not too much larger though. Since root rot is something to be concerned about maybe a ceramic or terra cotta pot with a well draining soil. Does that sound right?