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There is no reason to be insulting or rude because of a differing opinion. most people insult something they don't understand. Instead of providing some real proof, or reasoning to their argument.other mindless posts who are stuck in the dark ages.
I prefer 2g or more, but it's ultimately your call. You've heard everything from 1g to 30l, and any number of betta lovers here can produce fantastic fish within the range of potential tank sizes we've discusee in this thread. Good food, and warm and clean water are the key, whatever size you choose. If you do choose a tank on the smaller end of the "acceptable betta-keeping spectrum" , make sure you keep the water clean and change the water frequently. Some change daily, others opt for 3x a week. Depends on the keeper. Though they are great in filtered tanks, some floating plants or mosses are also fantastic for non-filtered tanks. Moss can grow with very little light and doesn't need to be attached to anything to grow effectively. Duckweed works well too and provides a nice anchor for bubble nests. These plants can also be removed for water changes and then stuck right back in when you're done.
A bit of extra advice. Try out one fish first and see if you like it. Changing water 3x on one betta is fine and dandy, but changing it 3x a week for 5, 6, 7, or 10 fish! Then it becomes a chore and their quality of life can potentially suffer if one tires of so many water changes.