New Barrel pond stringy web-like weed?
We have setup a wildlife pond in a half barrel. It has been setup for a week and a bit. Rain water from a water butt used. Native plants bought online, now in bags with gravel on the aqua soil. It is not in the sunniest spot (morning and late afternoon - about half the day). What could the stringy, green, weblike stuff which is now on the Hornwort, Creeping Jenny, edges of the bags etc? If I move a plant I can see it and it’s quite strong! Any ideas appreciated. Anna