C. brevis is essentially cared for like a miniature leopard gecko. Below is what I copied from a care sheet I wrote in 2016. Although I don't have any now, I have kept C. variegatus and also C. elegans which needs more humidity then variegatus or bravis:
Genus Coleonyx
The most commonly kept specimens of the Coleonyx genus are C.variegatus, ( “Southwest banded gecko” or “Tucson banded gecko”), C. brevis (“Texas banded gecko”), C. mitratus (“Central American banded gecko”) and C. elegans (“Yucatan banded gecko”). They are small (up to 4”-6”) eublepharid , nocturnal geckos native to southwest United States and Central America. Although all species live in rocky, relatively dry habitats, in general C. mitratus and C. elegans prefer a somewhat more humid environment.
Housing : 1.2 or 1.3 Coleonyx can easily be kept in a 10 gallon equivalent enclosure (10”x20”x12”)
Substrate: All Coleonyx enjoy digging and burrowing. They have been successfully kept on a coco fiber substrate, and have also been kept on a non-particulate substrate such as paper towels or ceramic tile. In this instance, it’s useful to include a shallow container filled with moist coco fiber that occupies approximately ¼-1/3 of the enclosure on the warm side. A hide can be placed on top of the coco fiber. Some keepers may choose to use sand as a substrate, but it’s not recommended due to the dangers of impaction.
Lighting – Heating: As a nocturnal species, Coleonyx does not require any lighting beyond the ambient light in the room in which they are housed. Belly heat should be provided by using an under tank heater (UTH) that covers approximately 1/3 of the enclosure to maintain a floor temperature of approximately 90F on the hot side. By placing the UTH on one side of the enclosure, a heat gradient can be maintained.
Humidity: C. variegatus and C. brevis are desert species that benefit from the option of a humid microclimate in the enclosure. This can be accomplished through the use of the moist coco fiber container described above. If a particulate substrate is planned for the entire enclosure, approximately 1/3 of the enclosure should be misted regularly and should include a hide. Regular misting is more important for C. mitratus and C. elegans.
Hide Box: Multiple hide boxes are ideal and should be placed in the humid area, the dry area and on both the hot and cool sides.
Water: Coleonyx should have consistent access to a water bowl
Cleaning: Coleonyx usually choose a single location for elimination. If desired, a piece of paper towel or a small tile can be placed in that area to make it easier to clean up the waste. A bioactive setup can be provided and seeded with isopods in the moist area and dermastid beetles in the drier area to facilitate cleaning. The entire enclosure can be regularly cleaned if desired, though as long as waste can be eliminated it is not necessary to regularly take the enclosure apart for cleaning. Coco fiber should be monitored for smell and quality and can be replaced if necessary.
Feeding : Coleonyx are avid hunters and enjoy live prey including small mealworms, silkworms, hornworms, locusts, crickets, roaches. Care should be taken to insure that the prey is not too large for them to consume safely. They should be regularly supplemented with Calcium, vitamin D3 and other appropriate vitamins and minerals.
Shedding: Coleonyx shed rapidly and regularly and eat their shed skin. They rarely have difficulty removing all the old skin during a shed.
Handling: Individual Coleonyx vary greatly in their tolerance for handling. Some will run and hide at any attempt to touch them while others permit limited handling. Due to their small size and speed, it is not recommended to handle them often.
Potential Health Problems: Coleonyx can develop Metabolic Bone Disease (MBD) if not supplemented regularly with calcium and vitamin D3. They also may develop conditions common to many geckos including but not limited to impaction (from ingesting particulate substrate), loss of digits due to incomplete shedding, upper respiratory infections, eye or mouth infections.
Aliza