Yeah I hear you about the warping. I may only use it temporarily as I've already purchased it. I may use weights (some beach rock etc) will look kind of cool. Maybe I'll build a frame from hardwood that I can epoxy to the edges that will hug the sides of the tank as well. This may not eliminate the warp over time but it will slow it comsiderably. The story about the octopus squirting water doesn't make me not want to use screen tho lol