how much algae would be bad for the tank?

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Carmen

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One of my tanks receives a lot of sun light during the day, and it has quite a lot of (black?) algae.
I just wonder when does it start to become a threat, how much can still be safe for my fishies and plants?
 
One of my tanks receives a lot of sun light during the day, and it has quite a lot of (black?) algae.
I just wonder when does it start to become a threat, how much can still be safe for my fishies and plants?
Could you post a picture of the tank, so we can identify the algae?
 
post pictures before cleaning so we can ID the issue. It might be true algae or blue green algae, which is actually a photosynthetic bacteria.
 

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