All those tanks are expensive to me. I'd just go to Petco or Petsmart, one of the big pet chains, and pick up a small tank for much less. A finnex stingray will be plenty of light for a nano tank and many people have success with them. The Planted+ puts out a lot of par when you are talking less than 12" of height. Probably too much for a nano in most cases. You can seed your new filter with established filter media and if you keep the bio load low, stock almost immediately. A single beta will most likely be fine with a portion of your old media added to the new filter.
What method of CO2 do you plan on using? Pressurized, DIY, excel? I'm interested because that will likely be the most expensive portion of this tank and determine your limit on lighting.
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