08-22-2008, 02:50 AM
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With all due respect, the only clear tie that I've found between Cyanobacteria control and Alkalinity levels is that by maintaining appropriate, stable levels of Alkalinity (along with calcium) helps to promote healthy coralline growth which would discourage Cyanobacteria growth via nutrient uptake. This is common knowledge in the hobby and is a frequent suggestion, coupled with improved husbandry practices, for the control of Cyanobacteria.
As for the information contained in the 2 links provided, the former does suggest that increased alkalinity "seems to help get rid of Cyanobacteria", however the poster provides no evidence whatsoever to validate this claim. Furthermore, he makes no suggestion that levels beyond the normal recommendations (7-11 dKh or 8-12 dKh depending on the source, and hence my "happy medium" recommendations of 8-11) would serve as any benefit. In fact, the poster recommended the OP keep his levels at 10-12 dKh.
The latter of the two links makes no suggestion at all that there is any tie between Cyanobacteria growth and Alkalinity levels. The mere mention of raising alkalinity in that thread can be easily attributed to the simple fact that the OP states his Alkalinity has tested in an area that his test kit deems as "low normal" (see post #4).
I do find it somewhat odd that a practice entertained, with successful results, by masses of local fish geeks in your area for over 10 years, would not have made its way into the mainstream pipeline of information swirling around the WWW by now. Especially something so globally problematic as Cyanobacteria control.
Again, I mean no disrespect in this post. I would love to see this claim proven as accurate and without consequence, and I would be happy to promote the idea if it is. But certainly you can understand my skepticism.