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If its growing in those areas there is probably detritus and other stuff settling there. Maybe you can either add more flow or rearange a powerhead to keep everything in the water colum so it will not settle.
I'm not sure about lights but someone else may be able to chime in.
I beat mine by just doing regular water changes (10% every 2 weeks) and adding more flow to keep anything from settling. I Have not seen it for over a year now.
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Chris
www.smmas.org
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