Start with both sexes
A group gives you a better chance of having both males and females, but numbers alone do not guarantee it. Adult females are often larger and have a more curved underside. A visible saddle contains developing eggs; eggs carried beneath the abdomen identify a berried female.
Colour alone is unreliable, especially across different colour strains. Young shrimp can be difficult to sex, and the absence of an obvious saddle does not prove that a shrimp is male. Ask a breeder for a mixed group if establishing a colony is your aim.
Set up for baby survival
A shrimp-only aquarium removes the risk of fish picking off the young. Plants and moss provide cover and grazing surfaces. Protect filter intakes, including apparently gentle ones: a safe intake for an adult may still draw in a tiny baby.
Keep water stable and supply a suitable varied diet. I consider 22–24°C ideal, although I’ve also kept shrimp successfully at cooler temperatures. Increasing the temperature simply to speed reproduction is not a substitute for good care.
I use plants and rockwork to provide shelter in my breeding tanks. You don’t need to copy a particular arrangement: focus on giving your shrimp protected spaces rather than expecting one decoration to produce a larger brood.
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What happens after mating?
A receptive female moults before mating. Males may become noticeably more active as they search for her. Afterwards, the female carries eggs underneath her abdomen and fans them with her swimmerets.
You can usually expect the eggs to develop over approximately 20–35 days, depending on conditions. Treat this as an estimate, not a countdown. Observe without repeatedly catching or moving the female, and do not try to remove healthy attached eggs.
Neocaridina babies emerge as tiny shrimp and remain in freshwater. They do not need the separate brackish-water larval stage associated with breeding Amano shrimp.
Help the first babies grow
Look closely at moss, the substrate and sheltered surfaces; new babies can be difficult to see. Keep their food nearby through established grazing surfaces and, where needed, tiny amounts of a suitable fine food. Avoid clouding the whole aquarium with powder.
During maintenance, check the bucket before discarding water and guard the siphon intake. Do not strip out all plant cover because babies seem absent: they may simply be hidden.
If breeding seems to stop
If you’re not seeing any breeding, I suggest first checking that you have mature animals of both sexes, then reviewing temperature, water tests, feeding and recent disturbance. If females carry eggs but you never see youngsters, consider predation, an unprotected intake and lack of accessible food or shelter.
Make one evidence-based change at a time and keep notes. A new group may need time to settle. More food is not automatically the answer, particularly if leftovers or nitrate are already accumulating.
Different Neocaridina colour varieties may interbreed. Keep colour lines separately if retaining a particular appearance matters to you; mixed offspring will not reliably preserve each parent’s colour.