Bear27 is a member right here - pm him and ask.
I had the first one built out of clear - didn't like how I could see through it - crud will settle into it, looks out of place in the tank - and the grate really stood out (of course that was because I built it out of eggcrate).
Mine's actually built out of "smoke" acrylic - it's not black if you shine a flashlight on it, you can see through it...
My acrylic came from excess / cutoffs from work - you'd have to talk to laird plastics or someone along those lines about costs of acrylic etc.
Andy
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