Is it just me or does everybody get the most stubborn algae on the edges of the glass?

five.five-six

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#1
Why is it the mist stubborn algae grows right at a bout a 1-1/2“ margin along the bottom of the glass and in the corners? It’s not like I go easy on those areas, in fact I pay special attention to those areas. But every month or two I have to go in with my hand and a razor to clear the stubborn stuff off.
 
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