[Buran_]

vi potrebbe interessare leggere questo, è un modo di leggere la presenza e lo sviluppo dei ciano in relazione ai cicli presenti in un dsb:

In the phosphate cycle the phosphate portion of food/detritus/waste enters the sand bed. It is immediately attacked by bacteria trying to reduce it. With this influx of food the bacteria population will bloom. As the food begins to be reduced and is no longer available the bacteria will begin to die off, once they do this the phosphate that they had fixed is released back into solution. Here usually algae is the first organism to take advantage of this. Cyanobactor and hair algae are usually the first on-the-job, they utilize the available soluble phosphates and begin to bloom themselves, this will continue until they use up all the available food stock. Then once again they begin to die off, at this point bacteria begin to reduce the rotting algae and once again bloom. What you will see is small blooms of hair algae and or cyano appear on your sand or adjoining surfaces, it will then disappear as it is reduced. As you continue to add more and more phosphate to your tank these blooms will get larger and larger until they will not disappear.
The balance of the cycles that occur in the sand bed usually do not have an impact on its health.