This question requires density to answer. Density is a ratio of mass to volume, and is dependent on temperature. Materials do have variable density based on temperature. The equation for density is mass/volume.
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The capacity (or volume) of a cylinder is pi*r2*h where r is the radius of the base and h is the height. Use this equation to find r and then double it to get the diameter.
Multiply them: density*volume = mass
Thirty gallons of anything is thirty gallons. Maybe you're asking about compressing helium, but you need to say what pressure you're using and what temperature, to determine how much helium will fit into a 30 gallon tank.
Use the volume fomula L*W*H
width = volume/(length*height)