Go with even 3/16" acrylic.... can cut with a carbide saw blade carefully, or a triple ground if you have one... make the panels 1/8" smaller than you need and then run beads on both sides... had mine like that for 2 years with no problems.... you aren't going for strength... just redirecting the water flow...
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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