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It will do just fine stuck in the gravel. That's how I have mine, and it took over half of my tank. Had a lot of pruning to do after a week, lol. But that's with a 65W CF on a 26G using Flourish Excel. My java moss is due for a trim real soon.
Edit:
I trimmed it down on Sunday to about half the depth of the tank, and here it is, Tuesday, and one strand is already on the surface, lol.
I have mine anchored into the gravel as well and it's growing completely out of control. I don't think I could keep it from reaching the surface if I trimmed it every day . The bottom is kind've brown, but it certainly doesn't affect the rest of the plant.
hornwort is a WEED. One of those noxious plant list type of weeds. I keep a sprig in my 29gal. in case I need to grow out fry cover. I throw about 3' (ft) a week of it away. I would say with high light and no removal in about 6 weeks I could completely fill a 29gal with the stuff.