Know what you are seeing
Shrimp shed their exoskeleton as they grow. A translucent shell with a split along the back is usually a molt left behind, and shrimp may eat it later. A dead shrimp is more opaque and does not have the same empty-shell appearance.
A white band behind the head is sometimes called a failed-molt sign by hobbyists, but appearance alone cannot confirm the cause. Observe whether multiple shrimp are affected and note when symptoms began.
Review recent changes
Test ammonia, nitrite, temperature, GH, and KH. Compare current readings with earlier records and source water. Look for a recent water change, a new additive, filter maintenance, or a heater problem that could have caused a sudden shift.
Mineral availability matters, but adding calcium or a buffer without measuring can create a second problem. Use care-guide ranges as context, not as a diagnosis.
Stabilize before treating
If a reading is unsafe, correct the underlying water issue gradually and use dechlorinated water matched as closely as possible. Avoid copper-containing medications and do not combine treatments without checking invertebrate safety.
If deaths continue despite stable readings, seek help from an experienced shrimp keeper or aquatic veterinarian and share test results, tank history, and product labels. Clear records help separate a trend from a one-time molt.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.