In the last week there was a question of the value of the aquarium store flourescent tube external reflectors. Since I am setting up a lighting system for a 45, I was in the hardware store looking for stuff this weekend. I have two ideas for a reflecting backing. - white vinyl flooring. cheap, waterproof, easily installed - tin foil. even cheaper, but not very structural, difficult to work with. Just wanted to share ideas with the other cheapskates. Tom