Understanding GH, KH & TDS for Shrimp

Understanding GH, KH & TDS for Shrimp

Keeping freshwater shrimp successfully comes down to one key factor: stable water parameters. Three of the most important measurements in shrimp tanks are GH, KH, and TDS. Understanding what these mean helps you create the right environment for Caridina and Neocaridina shrimp.

💧 What is GH? (General Hardness)

GH measures the amount of dissolved minerals, mainly calcium and magnesium, in the water.

These minerals are essential because shrimp need them to:

  • Build strong shells

  • Moulting successfully

  • Grow properly

Typical GH ranges:

  • Caridina shrimp (Crystal, Bee types): Lower GH

  • Neocaridina shrimp (Cherry, Blue, etc.): Moderate GH

Too low → moulting problems
Too high → stress and failed moults

Using shrimp mineral products helps maintain consistent GH.

💦 What is KH? (Carbonate Hardness)

KH measures the water’s buffering capacity — how well it resists pH swings.

Shrimp don’t handle sudden pH changes well. KH helps keep pH stable.

  • Caridina tanks usually run low KH

  • Neocaridina tanks tolerate higher KH

If KH is unstable, pH can fluctuate, which stresses shrimp.

🌡 What is TDS? (Total Dissolved Solids)

TDS measures the total concentration of dissolved substances in the water — minerals, salts, and other dissolved materials.

TDS gives a big-picture view of water purity and mineral balance.

Too low → not enough minerals
Too high → poor moulting and stress

Shrimp keepers often use a TDS meter to keep levels consistent during water changes.

⭐ Why Stability Matters More Than Exact Numbers

Shrimp adapt to a stable environment better than one that constantly changes.

Sudden shifts in GH, KH, or TDS can cause:

  • Failed moults

  • Stress

  • Shrimp deaths

Consistency is more important than chasing “perfect” values.

🛠 How to Control GH, KH & TDS

Shrimp keepers typically manage parameters using:

  • Shrimp mineral salts

  • Shrimp-specific substrates

  • RO water mixed with minerals

  • Shrimp-safe water treatments

These tools help maintain a predictable environment shrimp can thrive in.

📊 Ideal Water Parameter Ranges for Popular Shrimp

These are practical target ranges used by shrimp keepers. Stability still matters more than hitting exact numbers.

🦐 Caridina Shrimp

(Crystal Red, Crystal Black, Bee, Taiwan Bee)

These prefer soft, slightly acidic water.

  • GH: 4–6 dGH ✅

  • KH: 0–1 dKH (sometimes up to 2, but ideally near zero)

  • pH: 5.8–6.8

  • TDS: 90–150 ppm

✔ Active buffering soils are commonly used
✔ Low KH is important to maintain stable acidic pH
✔ Too high GH often leads to moulting issues

🦐 Neocaridina Shrimp

(Cherry, Blue Dream, Yellow, etc.)

More adaptable and beginner-friendly.

  • GH: 6–8 dGH (can tolerate up to 10)

  • KH: 2–5 dKH

  • pH: 6.5–7.8

  • TDS: 150–250 ppm

✔ They handle harder water
✔ Still sensitive to sudden parameter swings
✔ Stable GH helps proper moulting

🦐 Sulawesi Shrimp

Very different requirements from most freshwater shrimp.

  • GH: 6–8 dGH

  • KH: 3–6 dKH

  • pH: 7.8–8.5

  • TDS: 200–300 ppm (some keepers go slightly higher)

✔ Require specialised Sulawesi mineral salts
✔ Warm temps + mineral stability are critical

⚠ Important Clarifications

  • GH = minerals for shell/moulting

  • KH = pH stability

  • TDS = total dissolved minerals & substances

  • Rapid TDS or GH changes = failed moults

  • KH swings = pH swings = stress

🔑 The Big Truth

Shrimp often adapt to slightly different values if stable.
Most shrimp deaths come from sudden changes, not slightly imperfect numbers.

 

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