When it comes to betta tank setup, size does matter. While most bettas can survive in very small containers, they will live long, quality lives only when placed in tanks no smaller than a gallon or two 40 gallon breeder dimensions. Bettas have an organ called the "labyrinth", which allows them to breathe oxygen as humans do, and also allows them to survive outside water for longer periods of time. However, this does not give you the excuse to house your betta in a small jar. Actually, I find no problem with bettas being kept in small jars since most betta breeders in Thailand and other parts of Asia practice this with much success. The problem is if you cannot find the time to change the water of your betta's jar on a regular basis. Unlike with other aquarium fish, betta fish's water should be replaced at a more frequent basis if their long and flowy fins are to remain beautiful and vibrant. Therefore, if you want to choose the best tank setup for your betta, you should consider these essential things:

1.) Tank Size - Again, tank size matters. However, if you can't provide a tank larger than 5 gallons for your betta, you should be prepared to perform water changes every 3-5 days.

2.) Filtration - Bettas that are kept in tanks below 2.5 gallons can live without filtration. However, full water changes every 2-3 days are a requirement. If you house your bettas on tanks 5 gallons and up, you should get a filtration system since it is more difficult to perform full water changes on larger tanks.

3.) Heater - If you live in Asia like me, heaters are not necessary. However, if you live in countries that experience cold seasons, you definitely need a heater for your betta. Ideal temperature for a betta's water is between 75-82 degrees Fahrenheit. If you keep your fish in tanks smaller than 5 gallons, it would be ideal to get a small heater as regular sized heaters can heat up smaller tanks fast. Or, keep your tank in a warm room.

4.) Massive Water Changes - To give you an idea on how frequent you should change your betta's water, refer below:

Tank Size and Frequency of Water Change

Below 2.5 gallons- Every 2-3 days (100% water change)

2.5 to 5 gallons (Filtered/Unfiltered)- Every 3-5 days (100% water change)

5 gallons and up (Filtered)- Twice a month with 25% water changes once a week

5.) Accessories - I personally do not recommend adding accessories to tanks if you are keeping bettas with long and flowy fins such as halfmoons and crowntails. However, if you wish add accessories such as live or plastic plants, make sure they do not have very sharp or pointed edges that might tear your betta's fins. Like most breeders, I keep my 2.5 gallon betta tanks bare, with no pebbles (substrate), no plants, and no accessories whatsoever. The reason is that these accessories make tank cleaning very difficult 40 gallon tank. By leaving my tank bare, all I need to do when it's time to clean my betta's tank is siphon all the poop and dirt out and replace the water.