This is a 10 gallon tank? No 10 gallon tanks come with 2 x 15W FLOURESCENT bulbs. I suspect that you have 2 x 15W incandescent bulbs, which means that you have very little light in your tank. That's probably part of the problem. Try replacing the bulbs with flourescent ones. You can get 11W flouro bulbs (they say they are equivalent to a 60W normal bulb) to put in there instead, and they would greatly improve things, giving you vastly more light than you've got.
Another thing is that hornwort is a hardwater plant, so if you have soft water you may not be able to grow it at all.
Yet another thing: when I've had hormwort, it looks lovely if I float it, but if I grow it submersed (with the end planted in the substrate) it doesn't look so good, as there are big spaces between the leaf whorls.
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