Oh, thank you! I thought light was more of a factor. Anyway, I'm also trying to grow some in my basement. That book on aquaculture inspired me to try culturing again (I'd tried about 1 1/2 years ago for a few months and didn't get good results, and finally gave up). I set up a bunch of buckets outside with some algae and other things, and I set up some jars in my basement. I sent away for some cultures as well.
The lettuce experiment is one of the things that ended up in a horrible foul smell, but like I said, I'm going to give it all another go. Other things just didn't grow, things I tried to feed with an occasional cat food pellet, fish food, algae tabs, vegetable baby food, and yeast. That was in my basement, and maybe is why I thought taht enough light was what I was missing down there.