I am confused...
From Sears and Conlin - http://www.thekrib.com/Plants/Fertil...rs-conlin.html
"Because others have observed that tanks with CO2 fertilization have relatively little red algae , it tempting to speculate that at least some red algaes are able to utilize bicarbonate, giving them an advantage in aquaria where most of the available carbon is in this form (typically those with high carbonate hardness and high pH). "
They rely on
 Baensch, H. and Riehl, R. Aquarium Atlas Volume 2, Tetra Press, 1993.
On yet another internet location ( http://fins.actwin.com/aquatic-plant.../msg00077.html
) I find Neil Frank writing the following:
""Red algae primarily utilize free CO2 and are naturally found in soft waters
of relatively low pH or streams where CO2 concentrations are relatively
high. Their native stream habitat explains why these furry epiphytes are so
tenacious and will not disattach conveniently from plants. In my experience,
the red algae are only found to be fully developed and to be grwoing
profusely in acidic conditions. In fact, when a local Raleigh aquarium shop
owner buffered the water to neutal in the store's front display tank, the
algae died back considerably. The change was not permanent, but supports the
notion that acidic conditions are needed for optimal growth. These
observations seem to contradict the advice of the Germans. They recommend
introduction of CO2 to suppress the growth of red algae
[As I indicated elsewhere, I never saw mature red algae in my tanganyikan
tanks where I suspect free CO2 shifted to bicarbonates]"
Those messages seem to be contradicting. Also Diane Walstad says in her book that algae is favorable in hard water but also mentions that this is not the case for red algae...
So I am confused - could anyone update me as for the latest knowledge? What is the cause for red-algae and how can I naturally get rid of it (except for SAEs, bleach, etc ...),