a lot of us have found that the fast growing stem plants get to be a pain after a while. with not a lot of vertical growing room they get to the top very quickly and then grow out. After dealing with this for a few months, I finally ripped them out and used slowr growing non stemmed plants paired with moss. The stem plants are good while the other plants are growing out, but be aware, if they root, you will ruin your substrate trying to get them out later.... good to make a choice now. I think the HC could work, are you planning on using any CO2 source for it?