There is no need for store bought bacteria in this situation. It is a waste of money, But if you are determined to get some, then choose either Dr. Tim's One and Only or Tetra SafeStart Plus.
The best filtration one can have in a tank is a well planted substrate. Unless one takes steps to kill the bacteria living on the plants, you will get all you need on the plants.
You are actually doing a silent cycle. As soon as the plants are settled in, they will be your primary filter. Were you intending to do a lower light more lightly planted tank, cycling might be an issue, it is not in your case.
The set-up you describe is not for folks somewhat new to planted tanks. High light, pressurized co2 added tanks are a lot more complicated to maintain in a stable fashion.
Schooling fish, such as neons, school as a defensive behavior. If there is no perceived threat, they meander. I used a few true SAE for this. They are big enough that the neons school but the SAE are algae eaters and will never harm the tetras. There are plenty of other fish that can act as "school herders."