SaltFisher: No, not very often. The algae does not grow on the window, only towards the back of the tank where the lights are placed. To be honest, it looks kinda cool in person. I know that prolly sounds like an excuse not to clean it... lol But I've even had people ask how I got the "cool background" on the tank.
MorayMike: The leopard shark died a few months ago, due to combination of a fight with the black tip, and a pump accident.
Tony Detroit: Thanks
I'll have to check out that thread in DIY.