Don't let it discourage you! keep working with what you have, and it may just work!
There was a customer at the shop i occasionally work at, who was determined to grow a low foreground plant for her tank, but I did not think her lights would cut it. And given that it was glosso that she wanted to grow, her lights were just not enough to sustain the growth. She was disappointed cause i told her that she would be wasting $6 a pot for glosso, but one day after weeks and weeks of her coming back to talk to me, I told her to try it, and see if it works.
what do you know.... it worked. she split the pot, and within a few weeks the glosso started growing. didn't grow well.. but grew, and she was absolutely thrilled. Even came into store and gloated about it :lol:
so try growing it, cause its near impossible to apply a generic set of rules to our individual circumstances.