Oh I had another idea on those first mystery plants... could they be
Spiranthes cernua? Whatever they are, they are growing quite happily
just submerged below the pond surface... and spread by stolons, and have
apparently taken residence in 4 or 5 pots... as well as some free
floating fibrous plant "muck".
Here's another plant... maybe this is Helonias bullata? Or maybe just a
weed? It kinda looks like Manfreda virginica. :-)
http://www.badbear.com/dkramb/P3180013.JPG
And another, obviously aquatic, probably "weed", but it looks cute and I
wonder if someone can recognize it?
http://www.badbear.com/dkramb/P3180007.JPG
Please don't tell me duckweed. LOL.