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Re: cyanobacteria solutions?
Every aquarium I have ever had (both salt and fresh) with 0 ppm
nitrate developed blue-green algae problems. Cyanobacteria are able
to fix atmospheric nitrogen, and can grow in a nitrogen-poor
environment. It is a metabolically expensive process, but they can do
it. I keep a barrel of rain water for the carnivorous plants in my
greenhouse, and guess what? It has blue-green algae growing in it!
I have been using PMDD for about a year, and my blue-green algae
problems have vanished. I don't recall seeing your nitrate level, but
I am willing to bet it is 0. Also, if you have a high phosphate
problem the use of PMDD will lower it. If you don't already add CO2,
I recommend that, also.
Recurring outbreaks of blue-greens indicate something is out of
balance, and I guarantee it is easier and better to remedy the cause
of the problem, rather than a temporary antibiotic quick-fix. Good
luck!