Impossible to say there are too many variables, for example what stand will it be on, how wide is the tank, how deep from front to back, is it square, is it another shape, all need to be considered as obv water is a fluid and has now pre defined height etc
The only way you will find out is get your tape measure out and measure it including stand
if its a 20 gallon tall, commonly 24" x 12" x 16
if its a 20 gallon extra tall, commonly 20" x 10" x 24"
if its a 20 gallon Long, commonly 30" x 12" x 13"
measurements are length x width x height in inches
exact measurements may vary slightly depending on the manufacturer due to glass thickness and whether they measure the inside of the tank or the outside of the tank.
like 12$ to 16$ depending on what you get to go along with that.....
About 200 dollars and the stand about 100
That all depends on how big the fish are. The rule is "1 inch of fish needs a minimum of 1 gallon of water". The tank could easilly be overcrowded if it is stocked with large cichlids and understocked (if there is such a thing) if the fish are Neon Tetras.
a gallon
It cost $1.34 per gallon.
At $3.00/gallon, it will cost $72.
They cost around $10-20 depending where you buy them and what features they have. I would recommend buying a bigger fish tank like a 10 Gallon. They are very cheap, about $10.00 maybe $12.00. A 10 Gallon will do better and make the fish happier. The only reason to get a smaller tank is if you don't have very much space. You and your fish will be happier with a 10 Gal though. Your fish will grow larger, be more healthy and live longer. The rule of thumb is 1 Gal for each inch of fish you have.
How much gravel for 200 gallon tank
$1.16
A betta fish would be much more suited to a 1 gallon tank than a 'variety'. You shouldn't keep much more than one fish per gallon anyway.
A gallon of milk cost $1.01 in 1958
How much did a gallon of gas cosy in 1994 ?
No! The tank needs to be much much bigger, at least a twenty gallon. By the way, box turtles also require both land and water. I would also suggest not keeping them together, as the turtle may or may not try to eat the beta fish.