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If I have my tank in front of a window will a Black Poster board background (which will block the sunlight) keep the light from causing algae in my tank???
I use cardboard (from a cereal box) to block the light from a nearby window from entering the filter. It was getting a growth of filmy algae. I just checked it and it seems to be working well.
And if you were wondering, the leveling part of the filter broke off so a short length of PVC pipe and double sided tape is in its place.