don't think that'd work.....oh wait, maybe they put some water in the two normal tanks, placed that trail into the tanks, but with the bottom of the "trail" water tight against the bottom of the normal tanks, then had a fill hole at the top of the trail, which they filled the trail up with, then they sealed the fill hole, and lifted the trail up......i think that would still mantain the suction...but then wouldn't that water just stay there and not get filtered?