Quick answer: Amano shrimp (Caridina multidentata) are adaptable compared with many specialized freshwater shrimp, but the safest aquarium is not the one that hits one “perfect” pH or TDS number. It is the one that stays consistent. For a typical planted freshwater tank, a practical working target is roughly 68–78°F, pH 6.5–7.8, moderate GH, stable KH, 0 ppm ammonia, and 0 ppm nitrite. TDS can be useful as a consistency check, but it is not a complete water-quality measurement and there is no single universally correct TDS for every Amano shrimp tank.
If you are preparing a stable planted aquarium and want a larger algae-grazing shrimp, you can shop Amano Shrimp from Shrimp Up Aquatics. Before adding them, test your source water and the aquarium itself so you know the baseline you are actually working with.
Amano shrimp water parameters at a glance
Published care ranges are broad. Aquarium Co-Op lists Amano shrimp at about 65–82°F, pH 6–8, and moderate-to-hard GH, while Aquatic Arts publishes 60–80°F, pH 6.0–7.6, GH 4–14 dGH, KH 0–10 dKH, and TDS 80–400 ppm. Those ranges show that Amanos are flexible; they do not mean rapid swings between the low and high ends are harmless.
| Parameter | Practical planted-tank target | What matters most |
|---|---|---|
| Temperature | About 68–78°F | Avoid rapid temperature changes and overheating |
| pH | About 6.5–7.8 | Stable pH is more important than forcing 7.0 exactly |
| GH | Moderate hardness; roughly 4–12 dGH is a useful working zone | Enough calcium and magnesium for normal biological function and molting |
| KH | Use a level that keeps your source water and tank pH stable | KH is primarily about buffering; do not raise it just to hit a chart |
| TDS | Often 150–250 ppm in ordinary planted community tanks | Use TDS as a consistency clue, not as a stand-alone health score |
| Ammonia | 0 ppm | Any measurable ammonia should trigger investigation |
| Nitrite | 0 ppm | A cycled aquarium should process nitrite continuously |
| Nitrate | Keep low and controlled with plants and water changes | Watch the trend instead of relying on one universal cutoff |
Important: the “practical target” column is a conservative husbandry target for a normal freshwater planted aquarium, not a claim that Amano shrimp immediately fail outside it. The broad published ranges above are wider. If your healthy, established shrimp are doing well at a stable value slightly outside the practical target, changing the water abruptly may be riskier than leaving a stable system alone.
Temperature: stable is better than warm
Amano shrimp tolerate a fairly broad temperature range, but temperature affects more than comfort. Warmer water holds less dissolved oxygen, animal metabolism rises, and biological processes in the aquarium speed up. That is one reason a tank that is comfortable at 72°F can behave very differently after a summer heat wave pushes it into the low 80s.
For most planted Amano tanks, keeping the aquarium somewhere around the upper 60s through the mid-to-upper 70s Fahrenheit gives a comfortable margin. A heater is not automatically required if the room keeps the tank stable, but a thermostatic heater can be useful when room temperature fluctuates substantially. Read our guide on whether Amano shrimp need a heater and filter for a more detailed equipment discussion.
When doing a water change, matching temperature reasonably closely is more useful than trying to change the tank several degrees at once. If a shrimp tank has been at 72°F for weeks, replacing a large portion of the water with very cold tap water can create a stress event even though both temperatures might appear somewhere inside a published care range.
pH: stop chasing 7.0
Amano shrimp do not require exactly pH 7.0. Both Aquarium Co-Op and Aquatic Arts publish ranges that extend on either side of neutral. The more important question is whether your pH is stable and whether the rest of the water chemistry makes sense with it.
Frequent use of “pH up” and “pH down” products can create a cycle where the aquarist repeatedly forces the number one direction and the water chemistry pushes it back. That produces instability without solving the underlying cause. If pH is drifting, test KH and look at your substrate, source water, injected CO2, botanicals, and any rocks or media that can change carbonate chemistry.
In planted aquariums using CO2, pH commonly moves during the daily light cycle as dissolved carbon dioxide changes. The goal is not necessarily a perfectly flat pH line every hour; it is to understand whether the movement is expected and controlled rather than the result of collapsing buffering capacity or an accidental overdose.
GH: the mineral measurement shrimp keepers should understand
GH, or general hardness, primarily reflects dissolved calcium and magnesium ions. These minerals matter to freshwater animals and are particularly relevant to crustaceans because shrimp must repeatedly build and harden a new exoskeleton after molting. Aquarium Co-Op specifically notes the relationship between mineral availability and healthy molts, and its water-chemistry guide describes GH as an important indicator of calcium and magnesium availability.
Aquatic Arts lists a broad Amano range of 4–14 dGH. In an ordinary planted tank, a moderate GH is a sensible goal. If your GH is very low and shrimp repeatedly struggle with molts, mineral deficiency is one possibility—but do not assume every failed molt means “add calcium.” Sudden TDS changes, poor diet, age, stress, temperature, and other water-quality problems can also contribute.
If you are troubleshooting a molting problem, use our focused guide on Amano shrimp failed molts, calcium, and mineral balance rather than changing hardness blindly.
KH: the parameter behind pH stability
KH, or carbonate hardness, measures carbonate and bicarbonate buffering. In practical terms, KH helps resist sudden pH change. Aquarium Co-Op’s water chemistry guide explains that low KH provides less buffering capacity, while higher KH makes pH harder to move.
Aquatic Arts lists 0–10 dKH as a broad Amano care range, which is one reason it is misleading to tell every Amano keeper that one exact KH is mandatory. A planted tank using active aquasoil may run low KH by design. A tap-water community tank may naturally sit at moderate KH and remain very stable. Both systems can work when the aquarist understands the chemistry and avoids sudden changes.
If your source water already produces a stable pH and healthy shrimp, there is usually no reason to add carbonate products just to make KH match someone else’s aquarium. On the other hand, if KH is near zero and pH repeatedly crashes or swings unpredictably, that is a real reason to investigate.
TDS: useful number, incomplete information
TDS stands for total dissolved solids. A handheld TDS meter estimates how much dissolved ionic material is in the water, usually displaying the result in parts per million. It does not identify what those dissolved solids are. A reading of 220 ppm could represent a useful balance of calcium, magnesium, carbonates, and other ions—or it could include a very different mixture. Two aquariums with the same TDS can therefore have very different GH, KH, sodium, nitrate, and other chemistry.
That is why TDS is most useful as a consistency tool. If the aquarium normally sits around 190 ppm and newly prepared water is 185–200 ppm with similar GH, KH, pH, and temperature, the water change is unlikely to create a large osmotic jump. If the aquarium is 190 ppm and the replacement water is suddenly 450 ppm, stop and find out why before doing a large change.
Aquatic Arts publishes a very broad 80–400 ppm range for Amanos. That broad range is good evidence against treating “200 TDS” as a magic number. Many hobbyists keep Amanos successfully in a middle range around 150–250 ppm, but that should be viewed as a practical community-tank zone, not a species-specific biological requirement.
TDS can rise even when the tank looks clean
Evaporation removes water but leaves most dissolved minerals behind. If you repeatedly replace evaporated water with mineral-rich tap water, dissolved solids can gradually accumulate. This is one reason top-off water and water-change water are not the same thing. A water change removes dissolved material from the aquarium; a top-off only replaces water that evaporated.
If your source water is already hard or high in TDS, topping off with purified or appropriately low-mineral water can help prevent concentration over time. If you use reverse-osmosis water, remember that pure RO water is not automatically appropriate shrimp water—it usually needs to be remineralized before it is used as the main water source for animals that require calcium and magnesium.
Ammonia and nitrite matter more than hitting a perfect TDS
For a new Amano tank, the first water-quality question should be whether the aquarium is cycled. Ammonia and nitrite should be 0 ppm before shrimp are added. If either is measurable, the tank’s biological filtration is not keeping up with the waste being produced.
A sponge filter, mature biomedia, and adequate oxygenation all help support nitrifying microorganisms, but time still matters. A new filter is not “cycled” merely because it is bubbling. If you are setting up a new aquarium, see our guide to cycling a tank for Amano shrimp and algae eaters.
Nitrate is the end product most hobbyists track after the nitrogen cycle. Unlike ammonia and nitrite, the best nitrate target depends on stocking, plants, fertilizer use, and overall husbandry. Keep it controlled through plant growth, sensible feeding, and regular water changes rather than allowing it to climb indefinitely.
Tap water vs. RO water for Amano shrimp
Most Amano shrimp do not require RO water. If your tap water is dechlorinated, moderate in hardness, stable in pH, and free of problematic contaminants, it can be simpler and safer than trying to engineer water from scratch. Amanos are popular partly because they tolerate the kind of moderate freshwater chemistry found in many community aquariums.
RO or RO/DI water becomes useful when source water is extremely hard, extremely soft, unusually high in dissolved solids, inconsistent through the year, or contains something you are specifically trying to remove. In that case, use a remineralizer designed for the desired freshwater chemistry and verify GH, KH, and TDS before the water enters the tank.
The mistake is not choosing tap water or RO water. The mistake is changing between very different water sources without accounting for the chemistry difference.
Water changes: match the water instead of correcting the tank
Routine water changes should maintain stability, not create a new set of parameters every week. Before a large water change, compare the new water with the aquarium. Temperature is the obvious one, but GH, KH, pH, and TDS become increasingly important when the source water has changed or when you are using a custom RO remineralization recipe.
If a tank has drifted far away from the source water, do not assume a massive correction is automatically safer. Unless there is an emergency such as ammonia or a contaminant, several smaller corrections may create less stress than one abrupt change. Our safe water change guide for Amano shrimp covers this process in more detail.
Acclimation: parameter differences matter most when shrimp first arrive
Newly shipped Amano shrimp may be coming from water that differs from your aquarium in temperature, pH, hardness, and TDS. That does not mean you should spend hours leaving them in deteriorating shipping water, but it does mean you should avoid an instant transfer when the chemistry is very different.
Test the aquarium before the shrimp arrive. If possible, know the rough conditions the shrimp were kept in previously. A controlled acclimation allows the shrimp to adjust to the new water without a sudden osmotic shift. For step-by-step instructions, use our Amano shrimp acclimation guide.
How to troubleshoot common water-parameter problems
Failed molts
Check GH, KH, TDS, temperature, diet, and recent water changes together. Do not diagnose “low calcium” from one failed molt alone. A parameter swing can be just as relevant as the final number.
Frantic swimming immediately after a water change
Test temperature, ammonia, nitrite, pH, and TDS. Also confirm the new water was properly dechlorinated. A sudden difference between replacement water and tank water is a more useful clue than whether the final pH is technically inside a published range.
pH keeps falling
Measure KH and review anything that consumes or reduces buffering, including active aquasoil, acids from decomposing organic matter, CO2 use, and the chemistry of your source water. Avoid repeatedly adding pH-raising chemicals without understanding why pH is falling.
TDS keeps rising
Check evaporation top-offs, fertilizer dosing, mineral additives, feeding, and water-change frequency. A rising TDS trend means dissolved material is accumulating, but the meter cannot tell you which material is responsible.
GH is high but molts still fail
GH is not a complete mineral analysis, and molting problems are not caused by hardness alone. Review the entire system rather than adding more minerals automatically.
Do Amano shrimp need brackish water?
Adult Amano shrimp are kept in freshwater. The brackish or marine connection applies to their larval development, not to routine adult care. A 2021 study in Crustacean Research reared Caridina multidentata larvae across different temperatures and salinities and found successful larval adaptation across higher salinity treatments. That research is about larvae; it should not be used as an adult freshwater parameter chart.
If you are keeping adults rather than breeding them, do not add aquarium salt merely because Amano larvae have a saline developmental stage.
Frequently asked questions
Is pH 7.0 the perfect pH for Amano shrimp?
No. Amanos are kept successfully on both sides of neutral. A stable pH within a reasonable freshwater range is more useful than forcing the aquarium to exactly 7.0.
Is 200 ppm the perfect TDS for Amano shrimp?
No. TDS does not identify which dissolved substances are present, and published Amano care ranges extend far above and below 200 ppm. Use TDS primarily to compare your source water, tank water, and replacement water over time.
Can Amano shrimp live in hard water?
Often, yes. Aquarium Co-Op describes them as suitable for moderate-to-hard GH, and Aquatic Arts lists GH up to 14 dGH in its care range. Extremely hard water or a sudden move from soft to hard water can still create problems, so test rather than guess.
Do Amano shrimp need RO water?
No. Many are kept successfully in conditioned tap water. RO water is useful when source water needs to be controlled, but it should be remineralized appropriately before being used as the primary water for Amano shrimp.
Should I adjust pH quickly if it is outside my target?
Usually not. If the shrimp are stable and there is no emergency, identify why pH is where it is and correct the underlying chemistry gradually. Rapid “correction” can create more stress than a stable slightly-off-target value.
Does evaporation lower TDS?
No. Water evaporates while most dissolved minerals stay behind, so TDS can actually become more concentrated as the water level falls. That is why repeated top-offs with hard water can slowly raise dissolved solids.
Build stability first, then add the shrimp
The best Amano shrimp water is not defined by one magic meter reading. Start with a fully cycled aquarium, 0 ammonia and nitrite, moderate mineral content, a stable pH, reasonable temperature, and replacement water that closely matches the established tank. Use GH and KH to understand mineral and buffering chemistry, and use TDS as one more consistency check rather than the final verdict.
For the full husbandry picture beyond water chemistry, read our complete Amano shrimp care guide. When your tank is mature and stable, shop live Amano Shrimp from Shrimp Up Aquatics.
Sources and further reading
- Aquarium Co-Op — Care Guide for Amano Shrimp
- Aquatic Arts — Amano Shrimp Care Guide
- Aquarium Co-Op — The Fish Keeper’s Guide to pH, GH, and KH
- Kondo, Hamasaki & Dan (2021), Crustacean Research — Larval performance of three amphidromous Caridina species under different temperature and salinity conditions