How do you fix algae growth in an aquarium?
Is your tank by a window? If so you may want to move it away.
High light levels combined with nutrients (nitrates and phosphates)
will cause algae, at least in normal freshwater aquariums.
The causes for algae in saltwater are identical, but the algaes
are of different types.
The solution to algae issues is quite simple; reduce the amount
of light, and the amount of nutrients in the water, and the algae
will not be able to survive. Some algae in an aquarium is normal;
in fact, it is impossible not to have algae. There are many
different kinds of fish and invertebrates that can help control
algae by eating it. In freshwater, I recommend dwarf plecos, otto
catfish, snails, and algae eating shrimp. In freshwater,
herbivorous fish such as tangs and angelfish can help, but the best
control there are various types of snails.