Seeking co2 advice for 5 gal cube
I recently acquired a 5 gallon cube (current solo), and I am piecing together an aquascape to house some shrimp. The only usable part to the setup is the tank itself so I have added the following-
10" Finnex Fugeray planted plus clipon
Azoo Mignon palm filter 60
Hydor 25w submersible
I am working on the co2 setup and was hoping to upgrade my DIY system on a 46 gal by piggy-backing on this new setup. My thought was to purchase an Aquatek basic regulator and eventually add a splitter in order to do away with the DIY and forget about those damn 2 liter bottles! One step at a time though as I can't lay out too much cash all at once as the wife may get upset (trying to fly somewhat under the radar). I plan to get the nano up and running, wait a couple months and add the splitter with needle valves to the 46 gal.
My question is should I go with the adapter and use a paint gun setup or go for the real co2 tank and if so, what size tank?
Next step will be substrate, hardscapes, and plants, but I think I am good in that department.
Any advice would be much appreciated, thank you.