I too have my tank set up at a window. A 75G. I have "0"'s on all readings and a pH of 7.5ish.
I have pygmy cories, a choc pleco, 24 shrimp(red and ghost), 3 otos, a few(for now) freeloading ramshorn snails(they even climb into the hornwart to eat algae) and maylasians. I also have a Raphael cat and a Khuli loach, but they are seldom seen. All the others LOVE algae. So I do have some, but it stays under control.
And I find it a myth that SAE's or Otos harrass Discus. -Not sure what you are getting/have in your current tank.