50 Watts or there abouts is good for a 29 Gallon.
I think 2 x 24 W T5's off set to provide decent spread would be ideal for a 30" long 29 Gallon.
You do NOT need more than 2 W/gal to grow any species, Tonia, L pantanal, P stellata, any harder plants etc and certainly no foreground plant.
More light means more issues, more work and waste.
I have hair grass and have grown it for many years, it's a fairly low light plant.
CO2?
Now there's the larger issue............
As far as proof of low light, here's a dwarf hair grass tank with 1.5 w/gal, 108 w over a 70 gal tank:
If it cannot be done easily, then how is this tank possible with 1/2 the suggested light?
Here's an old 75 Gal with the same:
Less light= less CO2 demand, less nutrient demand, thus everything is easier to manage. Adding good CO2 to lower light tanks is really much easier, but many thing because they have CO2, that they should.......somehow be required to add lots of light.
No, you gain many benefits and get every last little bit of growth and virtually no algae using higher CO2+ low light. Rates of growth are a bit slower, but still nice and pretty. Algae is limited by light also, so any issues there are much less intense. CO2 stability is also much easier, placing less stress on fish.
Here's some HC with the exact same light intensity as the tank's above: