Gates,
I did not reply since Shawn gave you a decent answer. You had the ID correct in your other topic for photos 1,2,3,5,7, Egeria densa - giant elodea.
Photos 4&6 show an obvious naiad (Najas) one of the coarser toothed species; there are 5 species of naiad and a couple have have coarsely visible teeth -Najas marina and medium coarse teeth - Najas minor (brittle), N. guadalupensis (southern) and N.gracillima (northern or slender). I will not commit to a species name until I can see the shape of the basal lobes of the leaves and or the seeds which are improtant key features for speciation. From our photos I would not call it southern naiad. Since your leaves recurve with fairly coarse teeth it superficially looks like N.minor brittle naiad like Shawn suggested. Northern and brittle naiad look similar. Sometimes two species of naiad will occur together.
