Thanks! 180g - 2'x2'x6' . And the lights are Aquamedic 150w HQI, 10,000k. And I replaced the stock magnetic ballasts with the silent AM 150x2 electronic ballast.
You guys got me on the plexi, acrylic, whatever. I'm a newbie, was I using the wrong word?
It was made by KritterProducts, so I guess it's acrylic. Sorry!