I went to an Acrylic/Plastic fabrication & sales shop to get an estimate on a couple of dividers for my new 270g. tanks (72x36x24) and got quotes on Black, 3/8, acrylic cut to size.... I almost fell over when they told me the price! So I downsized the thickness to 1/4.... still way too much! So I purchased 2 sheets of .25" Expanded PVC in Black and decided to make my own.... These dividers are 34"x22.5" and was about a third of the price! Pictures posted in a bit....


) I used a 1x2 as a my fence (straight edge) to but the router against and to slide it along. 



