This tank its a challenge. I want to have high light plants and co2 but am having trouble finding a nice light to work with it.
the dimensions of the tank make it hard to find lights that will fit without hanging them.
Try a Finnex Fugeray. Since that tank is so long and shallow, it should provide plenty of light coupled with CO2. Also, the low profile will pair well with the aesthetic of such a long and low tank. A typical T5HO fixture will really be too dominant, in my opinion. If you go the T5HO route, 2x T5HO will be too much light - in my opinion.
It will be very high light. With substrate, distance from the bulb will be 6-8 inches in a 12g long. That is easily 100+ PAR from a reasonable quality T5HO. This will very much be a potential algae farm. A T5NO or even a T8 would be a much better choice if you are set on bulbs. A Fugeray will be 60+ PAR as well and still require good care with your CO2, but will grow anything you would like in a tank that deep.
You didn't mention you were on a very low budget. Fugeray is the same cost as most single T5HO units, factor in no bulb replacements every year and you'll come out ahead easily. I have not looked at T5NO pricing in a long time so I cannot speak for that.