This is a repeat of something I mentioned in my journal but I wanted to give it its own thread for increased visibility.

I have a 300 gallon (8'x2'x30") acrylic tank that I build a stand for. Upon placing the empty tank on the stand for the first time I noted that the stand is slightly bowed such that the right and left end of the tank rests on the stand but in the middle there is a gap, approximately 1/4" wide, between tank and stand. Note that the stand is not bowing due to weight. It is solidly built but just not completely flat.

I am wondering what the ramifications of this are and how to deal with it. I am particularly hoping to hear from anyone who has first hand experience with large acrylic tanks, or who has a good understanding on the mechanical forces at play in this situation.