I knew it was coming.lol so I can see put you in a room 4x4 6 foots height then you would live happy for life right? since it's more than enough room for you to turn around...So we don't need 5000 sq home to live and feel comfy...
To the OP. It is up to you how big (read small) of a glass prison is sufficient to house your fish that naturally has miles of water in which to swim. "What size is the minimum for a _______" may be the most contentious thread on a fish keeping forum. There will always be varying opinions and some extreme personalities who insist that their answer is the right answer. I have personally kept multiple silver aros and a jardini and you have my opinion on adequate tank size. Good luck.