Thanks for the kind offer but i'm in the uk!!! You're probably dead right, if i slowly fill my tank i reckon the foam will compress under the weight and things will even themselves out nicely. But as it is my first stand build that corner where my styrofoam is wobbly will forever haunt me. I got a 6 foot level today. The tanks coming off in the next couple of days and i'm going to sort it so it won't worry me in the future.