Beneficial bacteria actually removes nitrogen from the water column, starving the algae. Algae uses nitrogen as a food source – the more nitrogen, the more food for algae. Just like any other organism, algae grows when it eats and shrivels when it starves. If you cut off the nitrogen, it will not be able to grow.
Algae isn’t the only thing that makes your pond murky – especially if you have fish! Beneficial bacteria’s uses extend beyond removing nitrogen. It also can help to break down fish waste and organic matter, digesting and removing that unhealthy matter from the ecosystem.
How does beneficial bacteria tie into decorative gravel, you may ask? Decorative gravel actually gives beneficial bacteria a place to settle. It will rest on your gravel and get to work. Without the gravel, the bacteria cannot settle and all that gunk you want out of the picture will begin to thrive. The gravel indirectly fights the algae off!