Stability is the whole game for cherry shrimp
Cherry shrimp are small, hardy within their comfort zone, and genuinely stressed by abrupt change rather than by a bit of mess. A swing in temperature or mineral content can trigger a failed moult, which is how shrimp usually die after an over-enthusiastic clean — the new shell forms wrongly because the water changed faster than the shrimp's body could adjust. They also graze constantly on biofilm and soft algae, so a tank scrubbed to sparkling glass is, from a shrimp's point of view, a tank with its food removed. Every cleaning decision in a cherry shrimp tank should therefore favour smaller, slower and less often over bigger and thorough.
Guard every intake before you start
Fit fine mesh, a piece of clean stocking or a foam pre-filter over any siphon or filter intake before water moves: adult cherries can usually resist a weak pull, but juveniles cannot, and even adults get pinned against an unguarded tube. Use a sponge filter if you can, serviced by squeezing it in a bucket of removed tank water until the water runs clearer — never replace the sponge outright, since the colony living in it is both filtration and shrimp pasture. Drain into a pale bucket and inspect it under good light before discarding; there will almost always be at least one small shrimp to pipette home.
The small-and-slow cleaning pattern
Take out a modest amount of water at a time, siphoning from open areas and hovering above the substrate rather than plunging a vacuum into it, because cherries bury themselves in the top layer when startled. Leave the moults you find — the shrimp eat them to reclaim calcium and minerals — and wipe algae from the front pane only, leaving the sides and back as grazing. Refill by dripping or trickling the fresh water in over an extended period, matched in temperature to the tank, so the chemistry drifts instead of jumps. If a plant needs trimming, do it on a different day from the water change; stacking every disturbance into one session is what overwhelms them.
Breeding changes the stakes slightly. A female carrying eggs under her tail — berried, in shrimp-keeping language — is investing heavily in the next generation, and sudden change is at its riskiest for her, so during weeks when several females are berried, shrink the changes further and keep hands out of the plants where berried females hide. The payoff for that restraint is visible: shrimplets appearing in the moss a few weeks later, already grazing the biofilm your gentle cleaning left standing for them.
Reading the colony afterwards
A relaxed colony fans out across plants and substrate within the hour, grazing steadily, with bright colour and the occasional saddle or berries visible on females. Shrimp massing at the surface, lining up along the filter outflow, or dying in the day after a clean all point to water that changed too fast — next time halve the volume and double the refill time. Record the size and pace of each change, plus colony behaviour, in KinsLe via Care Teams so everyone maintaining the cherry shrimp tank keeps to the same gentle rhythm.