"Sacha" wrote
Any chance that frogs and/or tadpoles eat duckweed?!

It's taken me years to get rid of the stuff on our pond, had to buy a
skimmer (Oase SwimSkim) in the end and that has worked so far. Never seen
any of our fish eat it, indeed when they gulp down a mouthful of pellets and
accidentally get some Duckweed too they spit it out.
Maybe it's not carp that eat it.

--
Regards
Bob Hobden