A fat-tailed gerbil's answer to noise is depth
A fat-tailed gerbil rides out fireworks best when his tank gives him somewhere to dig away from them, so top the substrate up deep before the evening and add a cork tube or half-buried hide at the bottom layer. Duprasi are desert gerbils that shelter in burrows through the heat and noise of the day, and a tank that lets him get genuinely below the surface lets him use that instinct. Move the whole tank into an interior room earlier in the day — never during the display — and settle it on the floor or a low stand where vibration is least.
Secure the lid like he means to test it
The fat-tailed gerbil is a rounder, stronger animal than he looks, and a panicked one can push at a loose mesh lid. Clip or weight every corner of the lid before dark, check the water bottle hangs where it cannot be knocked into the substrate, and remove tall climbing items a startled leap could topple. Because this species is kept alone, there is no cage-mate to steady him — the security of the tank itself is the whole safety plan, and it deserves the full five minutes.
Leave a solitary gerbil entirely alone
Do not open the tank during the display to check on a fat-tailed gerbil, and do not offer your hand for reassurance. Duprasi are solitary and less hand-tame than Mongolian gerbils; a lid lifting mid-bang reads as a predator arriving, not comfort. Watch through the glass from a distance if you need to look in at all. Postpone the sand bath refresh, spot-clean, and any weighing to the following day — every ordinary disturbance stacks on top of the noise he is already enduring.
One more preparation pays off with duprasi: scatter a small portion of his seed mix into the fresh substrate before dark, so the first thing the noise drives him to — digging — immediately turns up food.
Hold the routine steady around the noise
Feed at the usual time, keep the room's lighting low and ordinary, and let a radio murmur in an adjoining room rather than in his. A fat-tailed gerbil's thick tail stores fat and reflects his condition over time, so it is not a same-night gauge; the useful signs are whether he emerges to forage later in the night and whether the substrate shows fresh digging by morning. Keep cats and dogs out of the tank room for the whole evening, shut door included.
When stillness the next day means more than fright
A duprasi who dug in for one loud night should be back to digging, sand-bathing, and eating within a day. Contact a vet with small-mammal experience if he stays hidden and refuses food beyond a full day, breathes with effort, or drags a leg after a panicked scramble against the glass. Otherwise, note which room and setup kept him calmest — displays rarely come once, and the arrangement that worked is worth repeating exactly.
For the one risk a tank cannot cover — a lid left open on the wrong evening — KinsLe's Lost Pet Alert System puts a free alert out to nearby members so a finder who corners your fat-tailed gerbil can reach you directly.