I may be missing somthing here but I thought nightcrawlers only lived in the colder climates. I've never seen one in the ground in SC and I would not have expected them to live in Texas either. 
We have had our best luck in low lying swampy or damp areas with a leaf cover on the ground. We just use a stick to scrape the leaves back and we can usually find a good many doing this. These are not as good as the redworns you buy in the bait store as they are somewhat brittle and for some reason the fish don't hit them as readily as redworms, but they will bite them
SeaRay
Mark 1:17 ...I will make you fishers of men