01-22-2012, 02:23 PM
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My colleagues have advised that these "stems" are moss anchors, sort of like roots, that the plant sends out to anchor itself to wood and rock. It is trying to "attach" itself to the water, in a sense. If these are trimmed off, it will spread other ways. The "pink" is not a flower, as we already knew (mosses do not flower), though it does look like one I admit.
I am also told that these are more likely to appear if the moss is not trimmed and not fertilized. Which probably explains why I have never seen any on my moss, which is covering all the wood in some of my tanks, but I fertilize weekly.
Back to other points earlier in this thread, mosses prefer subdued light and shade and often will not do well in direct or bright light. They do best in soft water which will have more dissolved CO2; in hard water they will manage if sufficient CO2 is present. Mosses are one group of plants that cannot use bicarbonates as a source of carbon, only CO2.