im realy sad i always thought the half gallon tank trend would never come to england but my local garden centre is now selling them and similar jars fo r fighting fish the poor things can barely swim anyone elses had this happen near them
Someone posted a while back either on this forum or another that I was using at the time that they kept their bettas in the "betta barracks". Those are the little boxes that hang in the tank. Some of the LFS around here use them rather than the cups.
Speaking from first hand experience, I know that they are much more active and "happy" when in a tank. I had to isolate one of mine a while back and put him in a breeder box hanging inside my 29 gallon (he wasn't sick, just had ripped his tail and fins and I had to figure out how to fix the tank, 2.5 gallon, he was in so it wouldn't happen again). The box is about 3" square and about 6" long. He didn't do anything but lay on the bottom (obviously no room to swim). He was swimming around fine before I put him in the box and then again after I put him back in his tank.