Troubleshoot
Cherry Shrimp Dying After Water Change
Mass shrimp deaths right after a water change is almost always chemistry shock—not random disease. Match parameters, dechlorinate, and never copper. Separate from slow color fading and from fish-only ich meds that wiped the colony.
- WC shock
- GH/KH
- Chlorine
- Copper
What you’re seeing
Shrimp on their sides within hours of WC; some jump; survivors hide. Molts may pile up if timing collided with a bad change.
| Pattern | Likely driver |
|---|---|
| Die-off within 1–6 h of big WC | Parameter / chlorine shock |
| Deaths after “plant fertilizer” | Copper / metal traces |
| Only berried females die | Extra stress + GH swing |
| Slow fade, few deaths | Color-loss path |
Likely causes (ranked)
Large % change with unmatched GH/KH/TDS
Osmotic shock cracks the molting process.
Quick test: You swapped >40% with different source water.
Chlorine / chloramine slip
Gills burn fast. Conditioner under-dosed or expired.
Quick test: City water, no measured dechlorinator.
Copper in meds or fertilizers
Inverts die; fish may look fine. Common after ich copper.
Quick test: Recent ich/finrot meds in the display.
Temp swing with the new water
Cold bucket dumped in. Compound stress with chemistry.
Quick test: Bucket sat outdoors; heater can’t catch up.
Fix order
-
Step 1
Stop changing water for 24–48h unless ammonia is toxic
If NH₃ high, tiny matched dilutes only. Otherwise let survivors stabilize. Read cherry shrimp care.
-
Step 2
Audit what entered the tank
Check conditioner dose, fertilizer copper, leftover meds. Remove carbon if you need to pull organics later—not as a miracle.
-
Step 3
Rematch parameters before the next WC
Measure tank vs remins / tap GH, KH, TDS, temp. Aim ≤20–25% changes. Use the WC calculator for volume.
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Step 4
Prevent the next wipeout
Drip acclimate new shrimp. Never dose copper. If fish need ich treatment, use QT—see ich planted protocol.
When to escalate
- Faded but alive → losing color.
- pH crashed overnight → pH crash.
- Ammonia after deaths → ammonia spike.
- Snail boom from leftover food → snail infestation.
Helpful products
Related guides
- Shrimp losing color — Related
- Cherry shrimp care — Baseline
- pH crash — Chemistry
- Ich (no copper) — Med safety
FAQ
How much water can I change with shrimp?
Often 20–25% when parameters match. Bigger only if you drip-match GH/KH/TDS/temp.
RO water kill shrimp?
Pure RO with no remineralization will. Remin to your colony’s known GH.
Can plants cause shrimp deaths after WC?
Unlikely. Copper fertilizers and meds do.
Should I remove dead shrimp immediately?
Yes—ammonia from corpses stresses survivors.
Is this new tank syndrome?
Possible if the filter isn’t ready—see NTS—but timing right after WC still points to shock.
Heater related?
A stuck heater can cook shrimp too—check heater malfunction.
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