Besides the Chara and filamentous algae already mention, you have a notable amount of southern naiad appearing in two of the photos (aka "bushy pondweed" in TX).
Grass carp are a viable long term solution (assuming your pond is "permittable" by TPWD), but as Bill touched upon, it may prove beneficial to the grass carps' success (and allow a lower stocking level thereof) to remove or otherwise chemically control a significant portion of the Chara and southern naiad before stocking with grass carp.

Kelly Duffie
Cypress, TX