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Discussion Starter #1 (Edited)
Hi guys newbie here, I have a 40gal freshwater moderately planted tank doing well 6 months running. Last night I noticed brown and green hairlike algae on the outflow of my HOB. The HOB is located close to the light so i'm assuming it has something to do with it. I don't find algae growing anywhere else in the tank. I do add flourish once a week and excel daily, Ammonia test shows 0 and I do not do test for nitrite or nitrate. Is there any cause for concern?? thx in advance for any input..
 

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There's always a possibility it can spread. If it were me I would just clean the filter and not worry about it.
 

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I keep the brown algae on my HOB inlet and filter body. Gives the ottos something to nibble on.
 

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Discussion Starter #4
Thank you guys for the insight. I will go ahead and clean the hair algae off my HOB
 

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Mine does the same thing. Just cause the filter is so close to the light. As you said just clean it off and go on :)
 
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