3d (edited) • Vet Cases⚕️
🐠 Case Study: Why Are All the Fish Dying at Once?
Meet Marco, a hobbyist with a beautiful 75-gallon community tank of tetras and gouramis he has spent two years building. On a Saturday morning he does a routine 40% water change. Within thirty minutes every fish in the tank is gasping at the surface. By the time he calls you, four are already dead.
You ask one question first: did he treat the tap water before adding it?
He pauses. He ran out of water conditioner last week and forgot to reorder.
You test the tank water. Chlorine reads 0.9 mg/L. You ask his zip code and check the municipal water report. His city switched to chloramine six months ago.
That detail changes everything.
Chloramine is not chlorine. It does not dissipate if you leave water sitting overnight. It does not off-gas with aeration. It is chemically stable and it is destroying the gill epithelium of every fish in that tank right now, oxidizing the delicate cells that handle both oxygen exchange and osmoregulation simultaneously.
You walk him through emergency treatment: a commercial chloramine remover to break the bond, then water changes to clear the released ammonia, aggressive aeration, and aquarium salt for osmoregulatory support.
💡 The takeaway: Chlorine and chloramine are not the same problem. Know which one is in your tap water.
For a full course on this condition, see the classroom or follow this link below:
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🐠 Case Study: Why Are All the Fish Dying at Once?
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