ok, I'm a bonsai newbie you could say. I got my first tree from a nursery about a month and a half ago, and it looked really vibrant with new growth and everything. I am at college and I went home this past weekend with my tree (I call it "grasshopper") and put it outside on my deck. I sat out for a while admiring the growth and just looking at it. It looked great.

Today I looked at grasshopper again and suddenly some of the leaves are yellowish. Imagine if you have a green shirt and spill some bleach on it.. that's how some of them look. I moved the branches around a little bit and saw that some of the discolored leaves were perfectly green where other leaves covered them.

Any idea what this could be? I'm really worried about my tree, it's been completely healthy and vibrant looking since I got it. Did I overwater yesterday? (once until drips came from the bottom)