Hospital Tank Guide
A hospital tank lets you observe or treat one fish without dosing the whole display tank. Keep it simple, stable, and easy to clean.
Observation, diagnosis, and treatment are different
Use this page to organize observations and first checks. Do not treat from one symptom alone; water-quality stress, injury, parasites, bacterial disease, and handling stress can overlap.
First checks
Match temperature, use dechlorinated water, provide oxygen with a sponge filter or air stone, and keep a heater and thermometer ready when the species needs stable warmth.
Often confused with
A quarantine tank, breeder box, temporary holding tote, or moving a fish when the main tank water is the real problem.
What to do now
Move fish gently, keep water stable, test daily during treatment, and return the fish only when symptoms and water conditions support it.
Safety note
This is triage, not diagnosis. Test water before treating, avoid mixing medications, and check species sensitivity for scaleless fish, fry, shrimp, snails, and other inverts.
Next safety steps
Before dosing, read aquarium medication safety. If one fish needs closer observation, use the hospital tank guide. For new arrivals, start with quarantine new fish.