Stubborn brown algae

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Laurence

Aquarium Advice Regular
Joined
Dec 26, 2009
Messages
96
I am having a problem cleaning the hard, stubborn brown algae off my acrylic aquarium. I have tried the acrylic foam algae removers but they don't work and will not scrape off the hard brown algae, no matter how much I rub back and forth. Is there some way I can removed this hard algae without scratching the acrylic? Anyone else have this problem?
 
The tank is freshwater with a diatom filter which clears the green water but of course does not affect the algae growing on the acrylic.
 
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