Bob A wrote:

Just to say thanks, I won't worry so much about massive water changes then.
I need to get that window covered though.

Consider a bristlenose pleco, who will help with that algae (but not eliminate
it). Consider also covering the side of the tank instead of the window. I use
those aquarium backgrounds from the fish store-they usually have plain black
and gradient blue that look pretty good. On my tank near the window, the
background is wrapped around all three sides for uniformity, leaving the front
open and glare free.