Oh ugh those wall bubble tank thingys make me cringe too! I can see now someone slamming a door or hitting the wall somehow and crash! Ya I agree anything under a gallon is just plain horrible. Just because they came from a lil cup at whatever store doesnt mean they can live in one forever. Ive seen some pet stores/fish stores who do have bettas in 10 gallon tanks,some all to themselves! Which is great. I dont understand that penn plax one either,divided into 4 and a lil tiny section for each betta? Might as well leave them in the cup!