mistergreen: yes, please
Gerald: thank you, I will try
Everyone: I got a reply from the author of "Filamentous Cyanobacteria" chapter from "Freshwater Algae of North America" book. He says about the CyanobacteriaX photos posted previously: "I think this is a tropical species. It is certainly Nostocales." He also thinks that most likely "The alga is in the Scytonemataceae", the genus may be Scytonema
To organize it:
Phylum: Cyanobacteria (4,637 known species)
Class: Cyanophyceae (4,637 sp., of which 65 sp. identification is uncertain).
Subclass: Nostocophycidae (1,472 sp.)
Order: Nostocales (1,472 sp.)
Family: Scytonemataceae (180 sp.)
Genus: Scytonema (130 sp.)
Yes, we do have an least two types of bearded Cyanobacteria in our tanks! May be they can be controlled by lighting and antibiotics? I will investigate this and post on my light thread. Should this algae thread, indeed, be "sticky-ed"?