"Smirking Ghost" wrote:

I have a one month old pond (1400 US gallons), the waterfall has developed
what looks like algae on the natural stone I am using for the waterfall. Is
this in fact algae or something else (moss?) Anyway, is this something I
should try to get rid of or is it harmless? I kinda like the look of it.

It is string algae. It loves moving water. It is harmless unless it
starts to float on top of the pond.

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