Low GH and moulting problems: check before dosing
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A failed moult does not establish calcium deficiency. GH describes part of the mineral composition but cannot explain why an individual shrimp died. Do not add extra minerals solely because of one dead animal or a visible pale ring.
Check the reading and the change
- Repeat the GH test with the correct sample volume and check expiry.
- Measure replacement water. When using RO, check the product, weighed amount and water volume.
- Compare with previous readings and conditions for the same species or line. Record ammonia, nitrite, temperature and recent major changes too.
If insufficient GH is confirmed, prepare replacement water with an appropriate mineral product. GH+ and GH/KH+ do not change the same properties; do not choose solely because a product says shrimp minerals. Verify prepared GH and KH, and adjust a stocked aquarium gradually when no acute contamination is involved.
When to investigate further
If losses continue despite suitable measured water conditions, adding ever more salt is not a supported next step. Share the timeline, photographs and measurements with an aquatic animal-health professional. Do not pull off a stuck shell. This article offers an investigation route, not a certain diagnosis or medication advice.
Sources and scope
- SRAC 464: Interactions of pH, Carbon Dioxide, Alkalinity and Hardness
- SaltyShrimp: Bee Shrimp Mineral GH+
- SaltyShrimp: Shrimp Mineral GH/KH+
Measurement and preparation principles come from the cited sources. The investigation sequence is an editorial judgement. Fish farming, drinking-water or livestock figures are not established safe limits or treatments for dwarf shrimp. Product instructions apply to the named product.
