Despite the bleak picture awap is trying hard to paint, there are several very interesting dives within an hour to hour and a half drive of Ft Worth. These include:
Possum Kingdom - 80-90 miles west, boat needed
Clear Springs Scuba Park - 60-70 miles east
Lake Murray - 80 miles north
Lake Broken Bow - 200 miles northeast (okay, three hours)
Lake Travis - 200 miles south (three hours)
Valhalla Missile Silo - I don't know the distance offhand
All of these have compelling dives. Some of them have decent visibility, especially in the cold months. If you're looking for crystal clear warm water with colorful fish then you could be in for a lot of travel time and expense. I don't recall that being in your original post however. Welcome to Texas!