Ideal Water Parameters for Cherry Shrimp
Short answer: Cherry shrimp (Neocaridina) thrive at pH 7.2, 75 F, and near-zero ammonia. Across 172 real shrimp tanks, the median pH is 7.2 (IQR 6.8-7.6), median temp is 75 F (IQR 72-78), and 92% keep nitrate at or below 20 ppm.
Cherry shrimp at a glance
- Scientific name
- Neocaridina davidi
- Adult size
- ~0.6″
- Temperature
- 65–80°F
- pH
- 6.5–8
- Minimum tank
- 5 gal
- Temperament
- peaceful
- Social
- schooling — keep 6+
- Reference
- Wikipedia
Cherry shrimp (Neocaridina davidi) do best at a stable pH around 7.2, 75 F, and near-zero ammonia. Those are the medians from 172 real shrimp tanks in the AquaGauge dataset (July 2026 snapshot, sourced from r/shrimptank). The numbers sit tighter than most care guides suggest, and stability matters more than any single target.
What real shrimp keepers actually measure
| Parameter | N (tanks) | Median | Mean | IQR (Q1-Q3) | Full range |
|---|---|---|---|---|---|
| pH | 109 | 7.2 | 7.2 | 6.8-7.6 | 5.0-8.2 |
| Temperature (F) | 40 | 75 | 74.7 | 72-78 | 68-80 |
| Nitrate (ppm) | 99 | 5 | 9.2 | 0-10 | 0-80 |
| Ammonia (ppm) | 85 | 0 | 1.2 | 0-0 | 0-50 |
Two things stand out. First, most shrimp tanks run slightly alkaline (69% between 7.0 and 8.0), not the low-pH soft water that forums sometimes recommend for all shrimp. Second, ammonia is overwhelmingly zero: the median, Q1, and Q3 are all 0 ppm. Any detectable ammonia is an emergency, not a data point to average.
pH: Neocaridina are not Caridina
Online advice often lumps all shrimp together. Caridina species (Crystal Reds, Taiwan Bees) need soft, acidic water around pH 6.0-6.5 with buffering substrate. Neocaridina, including cherry shrimp, tolerate a much wider range.
Across 109 tanks the pH spread is 6.8-7.6 (IQR). Only 8% of shrimp keepers report pH under 6.5. If your tap water lands between 6.8 and 7.6, leave it alone. Chasing a lower number with chemicals creates the swings that kill shrimp during molts. See the full freshwater pH breakdown for context.
Temperature: cooler than tropical fish
Cherry shrimp sit lower than bettas or tetras. The median is 75 F with 50% of tanks between 72 and 78 F, and no tank in the data exceeds 80 F. A room-temperature tank works if your house stays above 72 F. If winter drops your room below that, a small preset heater set to 74-76 F prevents overnight crashes.
Higher temperatures (above 78 F) speed up metabolism and shorten lifespan. Lower temperatures (below 70 F) slow breeding and feeding. The 72-78 F band gives the longest lifespan with steady breeding.
Safe nitrate level for a shrimp tank
The safe nitrate level for cherry shrimp is 20 ppm or below. Across 99 real shrimp tanks, 92% stay at or under that threshold. The median is just 5 ppm, and the IQR runs 0-10 ppm. Shrimp keepers run far lower nitrate than most freshwater fishkeepers.
Nitrate distribution in shrimp tanks (n = 99)
| Nitrate band | % of tanks | Verdict |
|---|---|---|
| 0-20 ppm | 91.9% | Safe. Most shrimp tanks sit here. |
| 21-40 ppm | 4.1% | Elevated. Increase plant mass or cut feeding. |
| > 40 ppm | 4.0% | Stress zone. Partial water change + find the source. |
The median of 5 ppm means half of all shrimp tanks read 5 ppm or less. That is lower than what most care guides target because shrimp keepers tend to run heavily planted, lightly stocked setups.
Why nitrate matters more for shrimp than fish
Neocaridina are more sensitive to accumulated nitrate than tetras, livebearers, or bettas. Only 4% of shrimp tanks in the dataset exceed 40 ppm, and those posts almost always describe problems (lethargy, failed molts, breeding stalls). Fish tolerate elevated nitrate with minor stress; shrimp do not.
Keeping nitrate low without big water changes
Weekly 10-20% water changes and fast-growing plants (hornwort, pothos roots, water lettuce) absorb nitrate before it accumulates. Avoid large water swaps (over 30%) because they shift GH/KH and temperature, which stress shrimp more than moderate nitrate itself. If nitrate creeps above 20 ppm between changes, add plant mass or reduce feeding before increasing change volume.
Ammonia: zero or trouble
The ammonia median, Q1, and Q3 are all 0 ppm. In a cycled tank, ammonia should always read zero. Any detectable level means the nitrogen cycle is incomplete, something died, or you overfed. Do a partial water change immediately and dose a water conditioner that binds ammonia (like Seachem Prime).
The mean of 1.2 ppm is pulled up by a few tanks with serious problems (max 50 ppm). Those are crisis posts, not normal readings. For the full ammonia breakdown across all freshwater tanks, see safe ammonia levels for aquariums.
GH and KH: the parameters people forget
The dataset tracks pH and nitrate more than hardness, but cherry shrimp need stable GH 6-8 and KH 2-4 for healthy molts. Low GH causes failed molts (the white ring of death). Low KH lets pH crash overnight. Test GH/KH monthly and remineralize with a product like SaltyShrimp GH/KH+ if you use RO or very soft tap water.
How we counted
We parsed water-parameter posts from r/shrimptank where keepers reported test results from real tanks. N varies by parameter because not every post reports every number. The dataset reflects what hobbyists actually measure at home with liquid test kits, not controlled lab conditions. Full methodology: How we collect and verify tank data. Figures are from the July 2026 snapshot (6,414 tanks total).
Check your exact stocking
Add your fish below to see stocking %, filtration load and compatibility for your setup — live.
Planning a Cherry shrimp tank. We start with your cherry shrimp and filter the list to compatible tankmates — untick to see every species (incompatible ones get flagged).
Stocking — under 85% comfortable · 85–100% full · over 100% overstocked
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Gear for this setup
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API Freshwater Master Test Kit (800 tests) Liquid reagent kit covers pH, ammonia, nitrite, and nitrate in one box. Check price on Amazon → -
hygger Small Aquarium Heater (25 W) Compact submersible heater with LED display, sized for 5-10 gallon shrimp tanks. Check price on Amazon → -
Seachem Prime (500 ml) Detoxifies ammonia and chlorine on contact, the go-to conditioner for water changes. Check price on Amazon →
FAQ
- What pH do cherry shrimp need?
- A stable pH between 6.8 and 7.6. Across 109 shrimp tanks that reported pH, the median is 7.2 and 69% of readings fall in the 7.0-8.0 range. Neocaridina tolerate a wide band as long as it does not swing.
- What temperature should a cherry shrimp tank be?
- 72-78 F covers the middle 50% of real shrimp tanks. The median is 75 F. Shrimp do not need a heater if your room stays above 72 F, but a heater prevents overnight dips in cool climates.
- How much nitrate is safe for cherry shrimp?
- Keep it at or below 20 ppm. 92% of shrimp keepers in our data do exactly that, with a median of 5 ppm. Nitrate above 40 ppm stresses shrimp and stalls breeding.
- Do cherry shrimp need soft water?
- No. Neocaridina prefer moderate hardness (GH 6-8, KH 2-4). Soft, acidic water suits Caridina species like Crystal Reds, not cherry shrimp.
Freshwater aquarist of 8+ years.