I've been experimenting with using clippings from vegetables in my tanks and seeing what will grow hydroponically and what won't. Has anyone else tried this? I have had success with sweet potatoes, celery, onions, leeks (which led to quiet a few really bad puns), carrots, and now I'm attempting parsnips. If you are going to try just a side note... onions and leeks grow extremely well in warm shallow water. However, they start to smell up a fish room very quickly.