If you're watering when the soil "feels damp when I put my finger about an inch into the soil, it's almost a sure bet you're over-watering. Use a wooden dowel (from a hardware or big box store), ends sharpened in a pencil sharpener, stuck all the way to the bottom of the pot to tell you when it needs water. If the dowel comes out wet or stained dark with moist soil, withhold water until the point in time when it first comes out clean/dry. Also, flush the soil thoroughly the next time it needs water. Your watering method ensures all salts from your tapwater and fertilizer continue to accumulate in the soil. The high level of salts + the plant's inability to move water efficiently because of waterlogged soil conditions are pushing the plant to a death by thirst in a sea of plenty. Al

Just keep eye on the healthy leaves. If other leaves stay healthy in 2 or 3 days, then nothing to worry. If the symptoms spread further, maybe soil nutrients deficiency is the cause. No need to cut off any leaves since they still able to do photosynthesis, but if you think remove unhealthy leaves will make you feel better, then go ahead. Seems that you have enough healthy leaves to support plant growth.

Leaves are the plant's power source, and they're not diseased, so removing them just weakens the plant's ability to replace roots that have died due to overwatering. Roots need air for oxygen, so monitor the soil moisture at the bottom of the pot with the dowel test and only water when it comes out dry to the touch. Here's a post by Al from this thread. I guarantee that following this advice will take care of your watering issues and stop any more brown areas. Read the whole thread to really understand what's going on. "The calendar isn't what determines an appropriate watering interval; and you, not the guys at the store where you bought the plant, are in the best position to determine when your plant does or doesn't need watering. When the skewer first comes out dry or almost dry is the appropriate time to water. There ARE some things you can do that will shorten the intervals between necessary waterings, which would mean the plant has a greater fraction of unsaturated soil for a higher % of time, which is decidedly a plus. Follow this link to info on how to deal with water-retentive soils."

Do a search in the “houseplants” section. There are hundreds of posts about this tree. Also, these two links will greatly help you. http://forums2.gardenweb.com/discussions/1476078/ficus-trees-in-containers-iv?n=223 http://forums2.gardenweb.com/discussions/2842847/container-soils-water-movement-and-retention?n=8