Duckweed becomes Whiteweed!

[rhyan]

First time to raise some duckweed that was given to me last December 30. I just put it in a small microwave plastic container temporarily since I don't want to put it in my Goldfish tank yet and I'm not sure if it will affect my bettas so I just leave it in the container but when I looked at it this noon of January 1 I was baffled that the leaves are all gone white like it was blanched/washed out! Is it because of lack of nutrients in a small fishless container, or because of the fireworks, or it was cooked from direct sunlight?(I placed the container outside just beside where other potted land plants are kept) I also remembered that during the New year celebration it was drizzling maybe the fireworks made the drizzle acidic that it washed the delicate leaves of the duckweed?(the potted plants are still green though). I doused some liquid fertilizer in the water in hope that the leaves will be green again.