The 175 litre Chocolate Gourami tank has been plagued by cyanobacteria for at least three months now. I have manually removed the algae on numerous occasions, only to have it re-appear a week later. Through all of my research I have found that online sources are very contradictory about what causes cyanobacteria. However, what is clear is that almost all of my tank’s parameters are contributing to the problem in some way. The high temperature (28 °C), negligible nitrate (0 ppm), low flow rate and high plant mass are all listed as contributing factors.
Online sources are just as contradictory when it comes to treating cyanobacteria. So, until recently, I was at indecision about what to do. Then an acquaintance of mine was kind enough to explain to me in detail what he believed was causing the cyanobacteria. He believed that the low nitrate level was starving the plants and allowing the cyanobacteria out-compete the plants. He recommended that I buy Seachem’s Flourish Nitrogen, assuring me that it would rid the tank of cyanobacteria.
So, as of today, I will dose the tank with Flourish Nitrogen. I am approaching this problem from a scientific point of view. So, I will endeavour not to alter any other parameters during this treatment. That way, if the treatment works, I can attribute it entirely to the addition of Nitrogen.
Over the next few weeks I will keep you updated about any further developments.