I dont know that it is a fertilizing issue. Have any of the leaves fallen off?

No leaves have fallen off and they feel normal.

My guess as to what is causing the marbling? Mother Nature. I don't see anything out of the ordinary with those leaves--some leaves just look like that...unless things change, I wouldn't worry....

Thanks Shelley. I kinda like the look of the leaves. As long as the plant is healthy, I'm fine with it:-)