what is a good betta fish tank size? I recommend 3.5 gallons and up, and have had a lot of success and had some very happy bettas in 3.5 gallon tanks, though this is the smallest I would recommend, and you must also consider the shape of the tank as well. A tall column shaped 3.5 gallon tank will not have a sufficient amount of surface area, and will not be a good choice. With a 3.5 gallon tank, decorating the aquarium can be a challenge. Betta's love to have good hiding places, but you also must not "crowd" the tank too much either, which can be tough with the small footprint of a
3.5 gallon betta tank.planted tank is always a better option.
Tank Size | L x W x H | Filled Weight |
2.5 gallon | 12" x 6" x 8" | 27 lbs |
5 gallon | 16" x 8" x 10" | 62 lbs |
10 gallon | 20" x 10" x 12" | 111 lbs |
15 gallon | 24" x 12" x 12" | 170 lbs |
20 gallon High | 24" x 12" x 16" | 225 lbs |
20 gallon Long | 30" x 12" x 12" | 225 lbs |
25 gallon | 24" x 12" x 20" | 282 lbs |
29 gallon | 30" x 12" x 18" | 330 lbs |
30 gallon Breeder | 36" x 18" x 12" | 348 lbs |
40 gallon Breeder | 36" x 18" x 16" | 458 lbs |
40 gallon Long | 48" x 12" x 16" | 455 lbs |
50 gallon | 36" x 18" x 19" | 600 lbs |
55 gallon | 48" x 13" x 21" | 625 lbs |