no benifit and it is ugly and look dirty, so I get rid of it anytime I see it on my glass.
It block the pores from the porous rock, making it useless for filtration.
It just consume good element from the water so I would say it is far from being beneficial.
I just remove it when ever I can and I do not tolerate even a tiny bit of it on the glass, not even the back glass. When it grow on my pumps, I scrape it off.
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More fish die from human stupidity than any other disease...
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