You need about one gallon for every inch of fish you have
A 12 by 27 hex fish tank holds approximately 30 gallons of water when filled to capacity.
2.25
A Betta fish generally needs a minimum of 2.5 gallons of water in its tank to thrive. It is important to provide adequate space, filtration, and water quality for the well-being of the Betta fish.
Truman Lake in Missouri has about 11.32 million gallons of water in it. There are several types of fish in the lake as well.
That would be appoximately 45 gallons, but its probably slightly less than that due to the thickness of the glass and the trim(if they is trim.
34.6 Gallons (131 Litres) :)
A good rule of thumb for fish placement is to try and equal inches of fish to gallons of water.
A 60x20x20-inch fish tank holds 104 gallons.
40 liters equates to 10.5669 US gallons.
Answer: 11.1 x+2.4=13.5 13.5-2.4=11.1
264.172 gallons.
that's imposible to tell. the tank could have small fish or large fish, or it could be overstocked or understocked. in order to tell you need to measure the length, width and height