I would clean it, but I would be cautious to avoid scratching the acrylic. Personally I would probably do a soak in bleach 1-20 with water or a stronger washing soda solution to soften the algae and then use a soft brush or wash cloth as needed.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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