Vegetable Garden Day 6

My vegetable garden is off to a good start. Most of my seeds have sprouted right on schedule. I'm having a hard time figuring out what is wrong with the corn. At work, the children planted corn from the seed and it sprouted very quickly. My corn seed pods keep getting this white fuzzy thing growing on top of the pod. I keep stirring the soil but it comes right back. I think maybe it's because I am growing them indoors and they're not getting as much sun as they'd like.

Here are some pictures of my tiny veggie plants.

The cucumbers are the strongest ones so far. I can't wait until I transplant them to the ground. I've already cleared an area for them and have planted a yellow tomato and a sweet pepper plant I purchased. Also, I'm experimenting with an onion that started growing while it was still inside our fridge. I can't believe it thrived rather than rot. Here's a picture:

I have no experience with onions so I'll have to read about it and figure out when they're ready to be picked.