I never thought I would have to ask this question: How to clean the glass of an aquarium? I envisioned using a scraper or squeegee and a lot of manual labor. I was surprised to find the complete opposite!
To keep the front and sides of our aquarium glass clean of algae we use a Mag-Float.
We only use this every 4-5 days as we have very little algae in our tank, but it makes the process of removing any cloudiness from the glass very easy. We only have two Clownfish at the moment, so I am unsure of how fish usually react to it, but our female Clownfish seems to hate it and chases it around when we use it.