> Also has anyone used Mylar as a reflective substance? We have mylar on our 125 gallon tank and are pleased with it. We didn't try to get it perfectly flat so the back of the tank doesn't look like a mirror. The plants hid 95 percent of it anyway. As I see it the light that was lighting the wall now has to pass through the tank. We have only 160 watt on the tank and everything is growing great. Mark