Cherry Shrimp Tank Setup: Size, Hard Water, and a Gentle Sponge Filter

Cherry shrimp are native to streams, rivers, ponds, and lakes across Taiwan, eastern China, the Korean peninsula, and Vietnam, generally in clear, vegetated water rather than open current. That background explains most of what this species wants in a tank: less raw space than a comparable fish, but noticeably less tolerance for hard water swings or a strong filter intake.

Tank Size

5 gallons is the practical minimum. Shrimp can technically survive in a 2-gallon nano tank, but 10 gallons or larger is the size for a healthy, self-sustaining breeding colony, since more water volume buffers the small, constant parameter shifts a growing colony naturally causes. Keep at least 10 shrimp to reliably end up with both sexes in a starting group.

A 10-gallon tank is a comfortable, stable choice for a colony that's going to grow. If you'd rather start smaller, a 5-gallon all-in-one kit works too, just cover its built-in filter intake with a pre-filter sponge before adding shrimp, more on filter intakes below.

Water Hardness: The Detail Most Fish-Only Keepers Skip

This is the single most shrimp-specific requirement on this page. The floor is a GH of 6 degrees (about 110 ppm) and a KH of 2 degrees (about 40 ppm). Hold pH between 6.5 and 7.5, the middle of the range this species tolerates. Mineral hardness is what a shrimp actually pulls calcium from to build a new shell after every molt, so a tank that's too soft leads directly to failed and soft molts. Test your source water before assuming it's automatically suitable. RO water, or tap that tests near zero, has almost no GH or KH to buffer with, so it gets remineralized or blended back with tap before any shrimp go in.

The starting dose depends on which kind of soft water comes out of the test:

• RO, rain or tap near zero. A shrimp remineralizer that adds both GH and KH does the whole job. Salty Shrimp GH/KH+ is dosed at about 2 g per 10 liters, which gives roughly 6 dGH, with KH landing at a little under half the GH figure. That clears both the GH and the KH floor in one step. Mix it into the water in a bucket, never into the tank.
• Tap with some hardness, just not enough. A GH-only product tops up what is there. Seachem Equilibrium is dosed at 16 g, about one tablespoon, per 80 liters (20 gallons), and raises GH by 3 dGH without touching KH. Tap that tests 3 dGH reaches 6 with one tablespoon per 20 gallons of new water. Dissolve it in about a liter of water first; the mix turns milky white.

Either way, dose the replacement water, not the tank, and let the tank's hardness rise one water change at a time. Retest after each change until the tank itself reads in range.

Temperature

A comfortable range of 60 to 82°F, with 72 to 76°F optimal, and an outer tolerated range as wide as 57 to 86°F. In practice, that means most home rooms sit comfortably inside this species' range without any supplemental heat at all, a real point of contrast with a lot of tropical fish. A heater is still worth having if your room regularly runs cooler than the high 50s, or if you want a stable, warmer setpoint for more consistent growth and breeding.

Filtration: Gentle, and Covered

Keep flow gentle, and make sure the intake can't pull shrimp in. Use a sponge filter, or cover the filter intake with a pre-filter sponge so no baby shrimp get sucked up. A sponge filter is the simplest way to satisfy both requirements at once, gentle output and an intake a shrimp physically can't be pulled into.

Substrate and Decor

A simple, inert substrate works fine, cherry shrimp aren't picky about substrate composition the way some plants are. Driftwood adds grazing surface as it develops a biofilm coating, and dried Indian almond leaves do the same thing faster.

The Non-Obvious Requirement: Let the Tank Mature Before Shrimp Go In

Cherry shrimp should go into an established, fully cycled tank, not a brand-new one. Beyond ammonia and nitrite reading zero, the tank needs real time for a biofilm layer to develop on surfaces and plants, since that biofilm is a meaningful part of what a healthy colony eats day to day. Dense live plants or moss speed that process along and double as cover where newly hatched shrimp can hide from adults, filter flow, and any fish tankmates. Amano shrimp do well in a similar setup and are a common, compatible tankmate; ghost shrimp tolerate a wider range of conditions, but an adult ghost shrimp eats shrimplets and will take a freshly molted cherry, so a colony you want to breed keeps them in a separate tank.

The Cherry shrimp encyclopedia profile has more on the species itself.

Sources & Further Reading