Just for interest sake. Given one or more sides of your pond how much of the liner is exposed above the waters average level? Obviously the shape and style of your pond effects liner exposure.
Mine does the same, all along the wall it trickles over, moss, carpet type algae grows beautifully.It's natural, just algae that is growing on the edges. I used to have one out-flow for that bog, but now it runs over the whole edge (something was in the way of the outflow, and I let it overflow the inside edge) and created this look. I kinda like it, too!
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