Hello fellow Texan fishkeeper!
I'm in Georgetown, just outside of Austin.
Have you checked the local rivers for darters? Look in shallow areas with fast-flowing water, plenty of rocks, and not too many plants to find them. Darters are little beauties when they sit still long enough for you to see them!
My adventures in keeping Indostomus crocodilus, the crocodile toothpick fish. AKA armored stickleback, paradox fish, and freshwater pipefish. Care is (to the best of my knowledge) exactly the same as Indostomus paradoxus.