From literature that I have read, it seems that cyanobacteria thrive's on light in about the 525nm range, where they have optimal growth. This is the red cyano, and not the blue-green, which thrive in conditions where the light is much longer, say in the 600nm range.
Now we know, as your lights get older, like us we have difficulty keeping things tight... so, our expensive MH's (and other lighting) start to degrade, resulting in longer wavelengths.
In addition, I know and from what aquaticreations has quoted and from my own tank (0 trates), it seems nutrients have little to do with it.. well that is a little stupid to say that, because everything requires some type of nutrient..
But why not grow in the form of a different type of algae?
And why, if water is ruled out by having the same water in my sump, and the same water in my tank, do I have cyano in my sump (in the dark area's as well) but not in my tank?
Cyanobacteria are prokaryotic (meaning they don't have a nucleus). They are considered phototrophs, as they derive energy from light, and are capable of photosynthesis. We also know that they are (contrary to what they are referred to) not algae, but bacteria, meaning they reproduce by fission or splitting (a form of asexual reproduction) to multiply.. now this part is where I start to believe in the light thing, because:
- if mechanically it can't stay where it is if you blast it, or increase flow, and.
- If it's survival is based on nutrients alone, why doesn't it just relocate and "fission" away somewhere else?
- If I solely replace my bulbs and nothing else, it dies...
I don't know all the answer's... It's just some things just don't make sense..