Is plexi-gl hazardous over a fish-tank?

Although I have a full hood and light for my 20H gallon freshwater fish tank, I have just added another strip light and in order to accommodate the two strip lights, I've removed the hood and replaced it with a sheet of plexi-gl that simply sits on the top of the tank. I didn't use gl because: 1) it's too expensive to buy a gl hood and 2) it's very brittle and could cause injury if it breaks. As of now, two bare fluorescent strip lights (no gl inlay) sit right on the plexi-gl. I want to know if there is any danger of hazardous chemicals seeping into the tank with water condensing on the underside and the heat of the strip lights on the top of the plexi-glass.