Reduction of cyanobacteria in domestic aquarium


Cyanobacteria is a crucial link in the nitrogen cycle, creating organic compounds and participate in nitrogen fixation by photosynthesis. Nonetheless, in reservoirs, as well as in domestic aquariums, overgrowth of this organism may damage the gentile ecological system due to toxins it produces.

The solution for reduction of cyanobacteria in home aquariums may be one or more of the next steps:

1.       Cleaning the aquarium by physical removal with a vacuum, partial water changes (15%-20% of the water) and scraping the glass and scrubbing the rocks. These steps should help to reduce the elevated wastes and nutrients that support its growth. Furthermore, these steps are important as preventive action.

2.       Reduction of light for 3-7 days. This step reduces the photosynthesis process.

3.       Adding phosphate absorber to the aquarium filters. The phosphate underlies basic nutrients compounds.  

4.       Adding antibiotics. This has several disadvantages including the potential to create a bacteria resistant strain or the potential to damage the ecological system, and therefore is less favorable.

5.       Adding another strain of bacteria which competes with the cyanobacteria over water nutrients and does not damage the aquarium gentile ecological system.