I'm wondering if I messed up here and need to start over. I'm at the stage where I'm filling it back up with the new sand. So I put the lateral assembly in the tank but it wouldn't really balance so I figured when I started putting sand in that would prop it up. Now it's full with 200lbs of sand, and the assembly is centered, but I think it isn't totally resting on the bottom. There might be a inch or so of sand under there. It was tough balancing it and getting the sand in there. Does that matter? Does the assembly have to rest on the bottom of the tank?