No. 2 looks like a Cryptocoryne, (Balansae maybe) I don't know the variety, but I have one that looks exactly the same. No onion bulb at the bottom of mine.
No. 3 looks like Echinodorus Tenellus (Pygmy chain sword)
Just my opinion, and I am very much a newby. In fact, I was just about to post a question regarding recommending a good book for ID'ing plants!