I'd definitely put a strip of some sort of rubber padding all the way around the bottom of that tank; I like the rubber mats that are sold for standing on concrete floors, cut into strips.
This is the result of the unbelievably crappy lumber being sold nowadays. Your tank isn't the problem, it's the warped, bowed and otherwise imperfect lengths of lumber.
When you buy wood, it pays to take the time to inspect each and every piece carefully, personally...and to unhesitatingly reject all the pieces that just aren't straight. If you need X number of pieces, and can't find that many straight ones...go elsewhere. It won't make you any friends at the lumber yard, but it will prevent woes like this.
Your stand is constructed of pieces of lumber that you merely cut to length and assembled, right? Nothing wrong with that, but...looking at the close-ups you show, that stuff looks as though it has never seen a planer, and was harvested by trained beavers. Typical of lumber being sold in many places.
This is the result of the unbelievably crappy lumber being sold nowadays. Your tank isn't the problem, it's the warped, bowed and otherwise imperfect lengths of lumber.
When you buy wood, it pays to take the time to inspect each and every piece carefully, personally...and to unhesitatingly reject all the pieces that just aren't straight. If you need X number of pieces, and can't find that many straight ones...go elsewhere. It won't make you any friends at the lumber yard, but it will prevent woes like this.
Your stand is constructed of pieces of lumber that you merely cut to length and assembled, right? Nothing wrong with that, but...looking at the close-ups you show, that stuff looks as though it has never seen a planer, and was harvested by trained beavers. Typical of lumber being sold in many places.
