In the early detection of cyanobacterial deposits good and regular observation play an important role. The cause can have very different reasons. Unfavorable flow conditions in the seawater tank lead to (colloquially) "gammy corners" with little to no flow. These areas are particularly prone to the colonization of cyanobacteria.
The use of phytoplankton is a very effective remedy against cyano deposits. Some phytoplankton, e.g. of the genus Synechococcus sp., some type of the cyanobacteria, displace the harmful cyanobacteria, but do not form any deposits and contribute to the balanced bacterial community in the reef tank.
In the early stages, the cyanos can either be sucked off and/or combated/displaced by adding bacteria. These agents are added drop by drop to the aquarium water as an additive. The dosage instructions of the various manufacturers such as Aqua Medic, Lyox or Korallenzucht must be carefully observed so that the other animals in the aquarium are not impaired.