I have a 20 long that I am using as a grow-out for Endler's. It contains about 25 vals in a 6" by 6" container, a little hornwort, and about 12 Endler's.
The water is moderately hard. The tank gets no CO2 or other nutrients.
The tank gets about 2 WPG of T8 light, plus about 2 hours of morning sunlight that strikes the right half of the tank.
The half that gets tthe sunlight has a luxuriant growth of BGA. I remove it periodically but it comes back. The other side has no BGA at all.
From this I conclude that excess light is the main cause of BGA in this particular environment, and maybe in others.
Bill
The water is moderately hard. The tank gets no CO2 or other nutrients.
The tank gets about 2 WPG of T8 light, plus about 2 hours of morning sunlight that strikes the right half of the tank.
The half that gets tthe sunlight has a luxuriant growth of BGA. I remove it periodically but it comes back. The other side has no BGA at all.
From this I conclude that excess light is the main cause of BGA in this particular environment, and maybe in others.
Bill