Yes the frill plant does look like the hornwort, but the hornwort has more of a reddish tone to it and bigger needles. The frill plant IMO is a more dainty plant. I have natural sunlight when its shining and use the light when its not. I will let you know how it works out as far as the amount of sunlight/light it needs.
OUCH! that does sound painful!! poor lil guy! yeh that hornwort falls apart and floats everywhere, I'm still vacumning it up! ugghhthanks!! I had hornwort, but it got stuck in the mouth of one of my cories and it looked really painful. He worked it out in a day or so. I was afraid to touch him b/c I didn't want to make it worse.