Diffused mirror (tint) all the way! Objects up close are clear, objects further away are fuzzy or dark. Helps to increase lighting efficiency and schoolers love it (if tinting two or more sides). In a planted tank it gives unbelievable depth. Makes your tank look much larger! Know whats even better? It comes in different transperencys too so you can tint the sides and still see through it when the lights are on. Acts like a two way mirror. The brighter side has the mirror effect while the dark side is transparent. Note: this really only works well if you run higher power lighting and is a bad idea for those with aggresive, territorial fish.
Yeah, I'm a retard... lol