No, Texas has several species of native freshwater Palaemonetes (like P. paludosus of US feeder fame and P. texanus). Not sure how effectively they'll control algae -- I mean, I'm sure they'll eat some, but they're not specialists or high-volume consumers. Texas also has four species of Macrobrachium but, in addition to going after fish, they probably won't help too much on that front either.
Unfortunately, zero atyid shrimp (from the family containing Amanos, fan shrimp, and the familiar dwarf species) are native to the continental U.S. apart from one or two amphidromous Caribbean species that make it up into southern Florida, the federally endangered Syncaris pacifica in California, and two subterranean species (also endangered) of Palaemonias in Kentucky and Alabama.
Palaemonetes pugio is a widely distributed western Atlantic and Gulf of Mexico species occurring from Canada to Texas (Kaplan 1988).