how much algae would be bad for the tank?

[Carmen]

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?

 

[connorlindeman]

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?

 

[connorlindeman]

When the algae cover the plants so much that it interferes with photosynthesis its a problem.

 

[Carmen]

When the algae cover the plants so much that it interferes with photosynthesis its a problem.

I see, alright, I think it's too much then.
I have been neglecting it a bit, better clean it soon.
thanks for the advice

 

[Colin_T]

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.