I'm trying my hand (for the first time) at gardening. I'm growing vegetables entirely indoors. I have an aerogarden that I use with seeds and once they are large enough, I transplant them. Right now I am growing 1 buttercrunch lettuce, a green bean plant, tomato, and cucumber plant. They've been growing like crazy and have been super healthy. I was about to put some miracle gro plant food on them this morning when I noticed spots on my lettuce. The brown spots are on one leaf but another leaf seems to be having the sunken areas as if it is experiencing the same thing, just not as advanced. Here are some pictures. Any ideas?
