Sonny: Greg nailed the ID with fanwort (aka cabomba). But, I'm a little puzzled by photos 10 & 11. The only discernible specie in #10 appears to be Nitella (a higher form of algae). I can't tell if the other plant-fragments are cabomba or some other submerged specie. I also couldn't verify the presence of slender spikerush; but it is possible that I just couldn't isolate it amongst the mass of stems.
There are reports out of FL that CLIPPER is doing a good job on Fanwort. Otherwise, RENOVATE, HARDBALL, NAVIGATE or fluridone should all prove effective - although one product might be better suited than the other under different circumstances, or depending on the overall objectives.
