Shrimp do not just live in water the way fish do — they build their bodies out of it, moulting and re-forming a mineral shell every few weeks. That is why hardness decides which shrimp will thrive in your home before any other factor does, and why the honest order is: test your tap water first, then choose the shrimp that already suit it, rather than buying delicate shrimp and signing up to remake your water every week for years.
The four numbers that matter
General hardness, GH, measures calcium and magnesium — the shell-building minerals. Too low and shrimp fail to moult cleanly, often dying mid-moult; too high for a soft-water species and the same process strains them from the other side. Carbonate hardness, KH, is your pH buffer: a reasonable KH holds pH steady, while near-zero KH lets pH swing, which shrimp tolerate badly. pH itself still matters, but for most keepers it follows from GH and KH rather than being managed alone. Finally, test for copper, or ask your water supplier about it: copper from household plumbing can be lethal to shrimp at levels fish shrug off, and no hardness reading warns you about it.
Match the shrimp family to the water
Cherry-type shrimp, the colourful Neocaridina family, are the forgiving option: they typically do well in moderate tap water with a middling GH, some KH to steady pH, and room-temperature to mildly heated water, breeding readily when conditions stay stable. Crystal and bee-type shrimp, the Caridina family behind the red-and-white patterns, want the opposite recipe — soft water with very low KH, a gently acidic pH and minerals added back in controlled amounts, usually starting from purified water. That is entirely doable, but it is a standing commitment: every water change must be mixed to the same recipe, forever. Amano-type shrimp sit between the two, hardy in many tap waters but unable to breed in fresh water, since their young need brackish conditions.
How to test properly
Use liquid drop tests for GH and KH rather than relying on a single strip reading, and test your tap water after it has stood, since suppliers' published figures are area averages and your plumbing adds its own character. If you are on well water, or your supply changes source seasonally, test again at different times of year. Note the results with the date, and retest the tank itself once substrate and rock are in, because some substrates soften water and some rocks harden it — the tank, not the tap, is what the shrimp will live in.
Stability beats a perfect recipe
Shrimp forgive water that is slightly off a published range far more readily than water that swings. Big weekly corrections, alternating hard and soft top-ups, and chasing pH with additives all create the fluctuations behind many unexplained deaths. Pick the family your water already suits, change water in modest amounts, and let the colony settle. When you need a second opinion on a border reading, KinsLe's Pet Services Directory can point you to a local aquatics shop that will test a sample of your tap and tank water and talk through which shrimp family your numbers genuinely support.