Blue-green algae / cyanobacteria? Or is it something else?

I will do a partial water change ... and get more water movement and aeration. I try to reduce the ventilation to keep carbon dioxide in the tank, but it may be better to increase the carbon dioxide injection and ventilation at the same time. I will also add more nitrate addition to the regular amount.

This was already appropriate and it makes this being abound even FASTER than ever. It seems to adulation annihilation bigger than a baptize change and fertilizer. Doubling the ablaze aswell gave it a boost. There has to be some other answer.

The sand is carefully vacuum twice a month that the 55 does
has the problem. These two reservoirs are set up side by side (same day)
all the same, but a harmless green algae, and
other provisions of this ugly looking black stuff. :-( I do not want to waste money
the addition of the plants when they know that these things are grown in them and drown them.