how many gallons in a 2ft tank

Most standard 2-foot tanks range in size from about 15-25 gallons. What are the other measurements?

I'm not too familiar with the Sleepy Cod. But if it's the Oxyeleotris lineolatus, that will get way too large for a 2-foot tank.
 
i know it would grow out

i know it will grow out of the tank but its only a few cm long so plenty of time and when it gets big i might put in in my 12ft tank with my oscar or my 4ft with my breeding pair
 
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