My hood and light just came today. Rather than spend what would have been over $100 to cover and light my 40 gallon breeder I decided to go with a 36 inch hood and that will cover most of the tank and to fill in the rest with a heavy grade plexiglass I have that was free. However, the plastic part where you'd normally put in filters and such is a little thin and the plexiglass while stiff is heavy. I've been told plexiglass bows over time. Thus I want to find something really strong, thin and flat to straddle across the aquarium to support both.