Aquarium conductivity for shrimp: what are the recommended levels for Caridina and Neocaridina?

The water conductivity is one of the most useful parameters for keeping aquarium shrimp, particularly Caridina.

However, many beginner aquarists only check the pH, GH, or KH without measuring conductivity.

So, what conductivity should you aim for with Caridina or Neocaridina shrimp? What do the values expressed in µS/cm correspond to? And above all, how do you interpret them correctly?

In this Shrimpsfood guide, we will simply explain conductivity and its importance in a shrimp aquarium.

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💧 What is water conductivity?

Conductivity corresponds to the ability of water to conduct an electric current.

Water containing very few minerals generally has low conductivity.

Conversely, water containing more mineral salts and dissolved ions generally has higher conductivity.

It is most often expressed in:

µS/cm = microsiemens per centimeter

In the world of aquaristics, we often speak simply of:

100 µS, 150 µS, 200 µS, 300 µS...

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🔬 Why measure conductivity in a shrimp aquarium?

Conductivity allows you to get an indication of the overall mineralization of the water very quickly.

It is particularly interesting when using:

• osmosis water;
• remineralizing salts;
• active substrate;
• demanding Caridina;
• water changes prepared in advance.

A conductivity meter makes it possible, for example, to verify that the water prepared for a change has a mineralization close to that desired in the aquarium.

This helps to limit excessive variations between the new water and the tank water.

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📊 What conductivity for Caridina and Neocaridina shrimp?

There is no perfect value valid for all shrimp.

The ideal conductivity depends in particular on:

• the species;
• the strain;
• the desired GH;
• the type of salts used;
• the water used;
• the breeder's habits.

One can nevertheless use certain ranges as indicative starting points.

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🦐 Conductivity for Caridina

Conductivity is particularly used by breeders of Caridina, especially for Crystal Red, Crystal Black, Taiwan Bee, Blue Bolt, or Pinto.

These shrimp are often kept with:

• osmosis water;
• GH+ salts;
• a very low or near-zero KH;
• an active substrate;
• controlled mineralization.

In this type of maintenance, the conductivity meter becomes extremely practical.

After remineralizing the osmosis water, you simply need to measure the conductivity in order to more easily replicate the same preparation during subsequent water changes.

For example, if your strain behaves perfectly around 150 µS/cm, the goal will mainly be to maintain stable water rather than to continuously modify the parameters.

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🦐 Conductivity for Neocaridina

Neocaridina, such as Red Cherry, Blue Dream, Yellow Neon, or Green Jade, generally tolerate higher mineralization than many Caridina.

It is common to keep them in water with higher conductivity.

But here again, you should not look for a number alone.

A Neocaridina kept for several generations in a given water will often be better adapted to parameters close to those of its original breeding environment.

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🧪 Conductivity, GH, and KH: what's the difference?

These three parameters are linked to the composition of the water, but they do not measure the same thing.

GH mainly corresponds to the total hardness, linked in particular to calcium and magnesium.

KH mainly measures the carbonate hardness and plays an important role in the buffering capacity of the water.

Conductivity, on the other hand, takes into account all dissolved ions capable of conducting electricity.

Water can therefore have high conductivity without necessarily having an extremely high GH.

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🔢 Conductivity and TDS: is it the same thing?

No, even if both values are often used to track water mineralization.

A TDS device generally displays an estimate expressed in:

ppm

While a conductivity meter directly measures conductivity in:

µS/cm

TDS devices generally use a conversion coefficient from conductivity.

That is why there is not always an exact and universal conversion between ppm and µS/cm.

Depending on the coefficient used by the device, two testers can display different values with exactly the same water.

For shrimp breeding, it may therefore be simpler to work directly in µS/cm.

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💧 How to measure conductivity?

The measurement is very simple with an electronic conductivity meter.

1. Rinse the probe with the water to be tested.
2. Immerse the probe in the water.
3. Wait for the value to stabilize.
4. Note the value displayed in µS/cm.
5. Rinse the device after use.

Some conductivity meters also offer automatic temperature compensation.

To correctly compare measurements over time, try to always measure under similar conditions.

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🚿 Conductivity of osmosis water

Good osmosis water generally has very low conductivity.

The exact value depends on:

• the quality of the tap water;
• the reverse osmosis membrane;
• the age of the cartridges;
• the possible presence of a deionization resin.

The more the conductivity of the produced water increases over time, the more it can indicate that certain elements of the reverse osmosis unit are beginning to lose effectiveness.

Conductivity therefore also allows you to easily check the quality of your osmosis water.

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🧂 How to remineralize osmosis water?

Osmosis water is very poor in minerals.

To keep shrimp, we generally add remineralizing salts adapted to the type of shrimp being kept.

The principle is simple:

1. prepare the osmosis water in a container;
2. gradually add the salts;
3. mix well;
4. wait for dissolution;
5. measure the conductivity;
6. gradually adjust to the desired value.

It is better to add the salts little by little rather than putting in too much immediately.

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📈 Why does conductivity increase in the aquarium?

It is common to see a gradual increase in conductivity between two water changes.

Several elements can contribute to this:

• evaporation;
• fertilizers;
• certain foods;
• certain minerals added to the aquarium;
• the accumulation of dissolved substances.

Evaporation is particularly important to understand.

When water evaporates, the minerals remain in the aquarium.

Conductivity can therefore increase even if you haven't added any salt.

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💦 What water should be used to compensate for evaporation?

To compensate only for evaporation, we generally use non-remineralized osmosis water.

Why?

Because the water has evaporated but the minerals have remained in the aquarium.

If you systematically top off evaporation with mineralized water, you risk gradually increasing the mineral concentration.

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⚠️ Is too high conductivity dangerous?

A high value is not automatically dangerous.

Everything depends on:

• the species;
• the composition of the water;
• the trend of the value;
• the adaptation of the shrimp.

The most significant problem is often a sharp variation.

Going quickly from water with very low mineralization to water that is much more mineralized can impose significant osmotic stress on the shrimp.

Stability therefore generally remains more important than the obsessive search for an exact value.

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📉 Is too low conductivity better?

No.

Very low conductivity does not automatically mean that the water is better for the shrimp.

Shrimp need mineralization adapted to their species and their maintenance.

Extremely mineral-poor water can be unsuitable if it is not correctly remineralized.

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🦐 Conductivity and molting problems

When an aquarium experiences molting problems, it can be interesting to check the conductivity.

But one should not conclude that a bad molt is automatically caused by conductivity that is too low or too high.

Molting depends in particular on:

• the GH;
• the mineral balance;
• the stability of the water;
• the diet;
• the general quality of the water.

Conductivity therefore constitutes an additional indicator, but it does not replace other tests.

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🔄 Conductivity and water changes

One of the best uses of the conductivity meter is for preparing water changes.

Before adding new water, compare:

the conductivity of the aquarium

with:

the conductivity of the prepared water.

The closer the parameters are, the more gradual the water change will generally be for the shrimp.

This is particularly important in aquariums containing sensitive Caridina.

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🚫 Frequent mistakes with conductivity

• ❌ thinking that precise conductivity automatically guarantees good water;
• ❌ abruptly modifying mineralization to reach a value found on the Internet;
• ❌ confusing conductivity and GH;
• ❌ automatically converting ppm and µS/cm without knowing the tester's coefficient;
• ❌ adding salts directly into the aquarium without preparation;
• ❌ compensating for evaporation with highly mineralized water;
• ❌ forgetting to check your conductivity meter regularly.

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❓ Frequently asked questions about conductivity

What conductivity for Caridina?

For many Crystal or Taiwan Bee type Caridina, we frequently encounter values around 100 to 200 µS/cm. The truly suitable value, however, depends on the strain, the GH, and the water composition.

What conductivity for Neocaridina?

Neocaridina are often kept with higher conductivity, frequently around 250 to 450 µS/cm. This is again an indicative range and not an absolute rule.

Is 150 µS correct for Caridina?

A value close to 150 µS/cm is commonly encountered in some Caridina husbandry. However, one must also check the GH, KH, pH, and above all the general stability of the aquarium.

Why does my conductivity increase?

Evaporation, fertilizers, certain mineral products, food, and the accumulation of dissolved substances can gradually increase conductivity.

Can you use only conductivity to prepare water?

Conductivity is very practical for replicating a standard preparation, but it is better to periodically check other important parameters such as GH and KH.

Conductivity or TDS: which one to choose?

Both can be useful, but working directly in µS/cm avoids the differences in conversion coefficients used by TDS devices.

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✅ In summary

Conductivity is one of the most practical tools for monitoring a shrimp aquarium.

• ✅ it gives a quick indication of the overall mineralization of the water;
• ✅ it is particularly useful with osmosis water;
• ✅ it allows you to reproduce your water preparations more easily;
• ✅ it helps to track the evolution of the aquarium;
• ✅ it does not replace GH, KH, and pH measurements;
• ✅ stability remains more important than a perfect theoretical figure.

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