i'm currently in a big question mark here on my face... should i use a 2x4 or a 4x4 for a 180 gal acrylic aquarium stand? some website says 4x4 and some 2x4. i don't want the stand to be too heavy but i don't want it weak. knowing it would almost have a total weights of 1,800 lbs of water and the rest... it is almost like a pick-up on top of a stand. anyone who has great experience and has tested a 180 or bigger? i'm avoiding an instant swimming pool in my living room