Beginner Gardening: Is this from low humidity?, 0 by jewelsbyshari

jewelsbyshari wrote:
I got several house plants from someone that wanted to get them out of his home. I'm a newbie to houseplants for the most part, though I have been aquiring as many as possible this winter season, trying to keep my normally deep winter depression at bay. It's been great having somethign like this to do, and the house looks great with all of the new life in it.

Anyway, this is one of the new plants I got from this person, it's about 6.5 ft tall. A Schefflera, I believe.

It's a pretty healthy looking plant, last night I washed all the dust of from the leaves with a wet rag.

There are two problems with it that I can see. One is that it has these large dark blotches, only on the uppermost leaves. Are they from low humity? Lack of light maybe?