Sizing for a cube..

[jleichtman]

I'm in the process of buidling a 24x24x18 cube and the formula works out to 45 gallon. I'm trying to figure out if I should order the 45 gallon packge.. the good news is I'm moving down to Tampa for a Job (well lakeland) and I can pick the rocks up locally.

How did other people size there cubes?

Thanks in Advance

Joshua