Setting Up a Hospital Tank for Sick Fish

A dedicated hospital tank serves a similar but distinct purpose from a quarantine tank, providing a space to treat already-sick fish without medicating an entire established display.

Why Separate Treatment Matters

Medicating a whole display tank can harm beneficial bacteria, live plants, and invertebrates unnecessarily when only one or two fish actually need treatment.

Basic Setup

A simple bare-bottom tank with a sponge filter, heater, and minimal decor makes medication dosing easier to calculate and keeps the environment easy to keep clean during treatment.

Sharing Equipment with Quarantine

Many hobbyists use the same basic setup described in our quarantine tank guide for both new-fish quarantine and hospital duty, just at different times.

Returning Fish to the Display

Wait until treatment is fully complete and the fish shows no remaining symptoms before returning it to your main tank, running carbon filtration first if medication residue needs to be removed.