Is it a single fluorescent tube, incandescent bulb (or 2) or LEDs? I've used the first 2 but not LEDs.
The good news, a 10g is shallow, so more light reaches the substrate if it's not shaded by tall plants. You might "try" glossostigma or staurogyne. Skip dwarf hairgrass & dwarf baby tears unless you have co2 (I'm guessing you don't; neither do I. I've kept both alive for only a short time, without much coverage spread, meh). HM (baby tears) vs HC (dwarf baby tears) --HM is much easier but...slow...
Dwarf sword plants ie chain swords (e. tennelus now or lailliopsis sp?) might work, as will dwarf sags but they might seem kind of large for a "ground plant" in a 10g. Crypt. parva is also nice but VERY slow growing.
A full carpet takes some work & time. Work on you tweezer planting skills, you're going to need them, lol!