I have a 200 liters (100 cm) aquarium. When I bought it I didn't know it could not be placed in front of the window so it grows algae now.
The algae is green and rough. I cannot remove easily. I can only remove with my nails.
The tank doesn't have a background picture(wallpaper).
I'm wondering if putting a background picture and/or a curtain can help deal with that.
It will be painful take off the water and fish in order to move the aquarium to a new place.