I fell victim the other day to one of the supposed "starter" kits for beta fish, the half gallon tanks when shopping for a beta. I'm a reptile/hedgehog guy and decided to buy a betta for my girlfriend for easter as they are quite beautiful fish. I've only ever seen them in very small tanks(in which they are pretty motionless) so I didn't think to look up the tank size beforehand like I usually do with any reptile purchase(reptiles tend to be very needy and specific).
After I brought home the beta and the tiny tank I finally decided to do some research and found out that the 1/2 gallon tanks were cruel and way too small, being an animal lover this upset me and I went out first thing today and bought a 5 gallon tank with a filter(on the lowest setting to keep current slow) and as soon as I put him in it he started exploring the tank, in the tiny tank his fins were droopy and now they were fanned out fully and great looking.
The temperature in the room is about 72.5f so I will be going out to get a heater monday when shops open again but for now I don't believe the temperature will fall below 70 since the house is maintained with heat/air conditioning at a steady temperature.
I really can't believe they are allowed to sell such tiny tanks in pet stores and from now on I will definitely be doing a fair bit of research as I would like to get a snail to clean up the tank/food bits as well as maybe a small tankmate that cooperates well with a betta.