I just bought a cheapo T8 from Home Depot. I liked the idea of the "diamond" fixture and it looks more shiny. Another fixture had a gull wing type of metal reflector, which looked better, but the bulbs were far from the reflector.
The brightest light seemed to come from the $ 18 white skimpy reflector that has the bulbs up close.
I think I'll get another one - 128W of T8 on a 2' tall tank should be able to reach the bottom with a decent amt. of light.
I tried it with some foil and with mylar, but the white seems just about as good