One of my local stores sells some bettas in "setups", mostly vases that are a gallon or less, have only one plant, and no heater. I almost asked to borrow $20 to buy one of these setups, because it is so unimaginably cruel that I don't want them using it anymore. It's probably about a CUP of water, with a relatively large plant in the middle, so the fish maybe has half a cup of water to swim in. I went in today to get my water tested, and was absolutely appalled to see that some idiot employee had put a giant in this tiny thing! I'm praying I have the money to buy the entire thing, along with a proper home, with my next check... might divide the 10 gallon I'm planning to get in three instead of half so I can help this poor guy :( Even three gallons has to be better than half a cup!