It depends on how big your fish are and what type of fish they are, its worth asking the person you buy the fish from. On average you can fit about 20 tropical fish in a 2ft tank.
998.8 lbs.
This tank contains V = 2ft x 1ft x 1ft = 3ft3. Alternatively: V = 0.76m x 0.38m x 0.38m = 0.110m3 = 110dm3 = 110 litres.
You need another dimension to figure out how much water it can hold, you need the height, length, and width.
0 it has no depth
A tank this size holds up to 3,004(3,003.967872) gallons.
1 x 2 x 3 = 6 cubic feet. If filled to the top, there are almost 45 gallons of water in 6 cubic feet. 1 cubic foot holds 7.4 gallons.
750, if you need no extra!
180 gallons
82 inches = 6.83 (2DP) A tank which is 3ft wide, 2ft deep and 82 inches long can hold 306.1206 Gallons. Just for interest, the tank would of been 40.98 cubic feet.
A fluval3 would be perfectly OK for a 2 ft tank. The important thing is never clean all the filter media at the same time. This ensures that you do not loose all the necessary aerobic bacteria and have to go through a new cycling period each time you clean it.
2ft is 24in.