Just a little thought...when I filled my tank after I built a stand for it I only filled it 1/3 first let it sit a day and then checked to make sure everything is level. The 2X4s like to smush down some when adjusting to the new weight...its a "wood cell structure thing." Then I filled to 2/3'rds etc. waiting a day etc...you get it I'm sure. Nice stand looks great