Pictures are a little blurry, but here are my guesses:
#2----Hemianthus micranthemoides (but leaves look a little bit large for that species)
#3----Cryptocoryne crispatula, var. balansae
#4----A narrow leaved Anubias species
#5----Echnodorus species. The roundish leaves look like emersed growth. The one narrower leaf
looks like submersed growth. There are so many new hybrids being produced, that I am not
going to try to guess which one it is.