The short answer
It depends on which species — and there are two traps. Mixing different colours of the same species (all Neocaridina, like red cherry and blue dream) leads to crossbreeding, and the offspring turn a muddy wild-type brown. Mixing different genera (Caridina with Neocaridina) avoids interbreeding but forces a water-parameter compromise that leaves one species unhappy. Some combinations work fine; others quietly ruin your colony. Know which is which before you mix.
The interbreeding trap
Red cherry, blue dream, yellow, orange and green shrimp are all Neocaridina davidi — the same species selectively bred for colour. Put two colours together and they breed freely, but their babies revert to a plain brown within a few generations, undoing years of selective breeding. If you want to keep a colour pure and breeding true, keep one Neocaridina colour per tank.
The water-parameter trap
Caridina shrimp (crystal red, bee shrimp) and Neocaridina (cherries) don’t crossbreed, so mixing them keeps colours clean. But they need opposite water: Neocaridina want harder, more alkaline water, while Caridina need soft, acidic conditions. Run the tank for one and the other struggles. Only advanced keepers with carefully controlled water attempt this.
Safe combinations
- One Neocaridina colour on its own — the easiest, most reliable choice.
- Amano shrimp mixed with anything: they won’t breed in freshwater, so no interbreeding and they tolerate a wide range.
- Snails alongside any shrimp — see can nerite snails live with shrimp?
Get the water right first with best shrimp tank and how to set up a shrimp tank. Care sheets: cherry shrimp, amano shrimp and crystal red shrimp.