Shrimp live close to chemistry that other animals shrug off. A spray used across a room settles on the water surface, dissolves through it, and meets a colony with very little tolerance for solvents, fragrances or insecticide traces. The absence of an obvious smell at tank level proves nothing, which is why a suspected exposure gets treated as a real one from the first minute.
Clear the Air and Stop More Reaching the Water
Your first actions protect the surface. Spraying stops immediately, the product leaves the room, and windows and doors open so fresh air moves through and carries the residue out. While the air remains heavy, the tank gets covered with its lid or a clean cloth, because droplets still settling are droplets still entering the water. An air-driven filter draws room air into the tank, so pausing that air supply during the worst of the clearing protects the water, with normal running restored once the room smells clean again. Nobody sprays anything else to mask the smell; a second product layered over the first doubles the colony's problem.
Dilute What May Already Have Entered
Your water change follows once the room has cleared, using conditioned water matched to the tank's temperature and added gently so stressed shrimp are not battered by a current. A partial change lowers whatever dissolved without shocking the colony with entirely new water. Fresh carbon goes into the filter at the same stage, since carbon draws many dissolved chemical compounds out of circulation as water passes through it. If restlessness continues into the following day, a second, smaller conditioned change repeats the dilution rather than escalating to drastic measures, and the carbon stays in place while symptoms persist.
Watch the Colony and Note What Was Used
Your observation over the following days looks for behaviour the colony does not normally show: shrimp darting repeatedly, gathering at the surface or filter outlet, refusing to graze, or deaths appearing among animals that were feeding hours earlier. A written note of the product type, when it was sprayed, how close to the tank and what you changed afterwards turns a vague worry into information an aquatic shop or veterinarian can actually use if losses continue. Those notes also protect the colony later, since a delayed die-off days afterwards can be matched back to the exposure instead of being mistaken for a feeding or water problem with a different cause.
Your colony's most vulnerable members set the pace of that watch. Freshly moulted shrimp hide while their new shells harden and can be lost to a chemical insult without ever appearing at the glass, and tiny shrimplets graze low among plants where a keeper's count misses them entirely. Judge the colony by its grazing adults at the usual feeding spot across several days rather than by a single headcount, and treat a return to scattered, unhurried grazing across the whole tank as the sign that the water has cleared its burden.
Make the Room Rule Physical, Not Just Agreed
Your prevention afterwards removes the accident's ingredients. Cleaning near the tank switches to liquids applied to a cloth at a distance, never sprays released into the room's air, and cleaning products are stored in a different room from the aquarium altogether. A cover that lives on the tank during any nearby cleaning turns a household habit into a physical barrier, and every person who cleans the home hears the rule directly rather than inheriting it second-hand. The follow-up itself gets shared out through KinsLe, where Care Teams places tomorrow morning's carbon inspection and the evening colony count with named people, each task stamped complete only when somebody has actually stood at the glass.