The Quarantine (Hospital) Tank
Introduction
Whether you're on your first tank or your 50th, you should strongly consider having a quarantine tank. For the very small cost in money and time these tanks require to setup, they give back ten times that in the peace of mind that you are doing your best to keep all of your fish, new and old, safe and healthy.
Good fishkeepers have quarantine tanks for two main reasons:
1. To acclimate and monitor new fish for disease and behavior problems before they are introduced into a tank with other fish.
2. To isolate and treat sick or problem fish, protecting your other fish and allowing you to treat just the fish that need treatment in a smaller environment.
Basic setup
Unless you keep large fish, a simple 10, 15 or 20g tank will probably suffice. Smaller tanks require less medicine to dose properly. Cover the back (and preferrably the sides) with a dark background. This will make the fish feel safer and less stressed during isolation and/or treatement. You will also need a heater strong enough to keep the water temperature steady at up to 85 degrees and a reliable hang-on-back filter. HOB filters provide good filtration and circulation, are easy to move and maintain, and allow you to change inserts as needed for handling medications.
Lighting should be low and substrate kept to a minimum. A bare tank bottom is best for cleaning the tank and monitoring the inhabitants. Decor should be simple, sterile, and easy to clean. Soft fake plants and overturned flowerpot caves are good options to allow fish to feel safe and secure while being easy to remove and clean regularly.
Tips
1. New fish should be kept in quarantine for 2-4 weeks depending on the source and visual health of the fish. This will give you plenty of time to monitor the fish for disease and general health levels and allow the fish to adjust to your home's water source if necessary.
2. When you are not quarantining new fish, the tank can be used as a hospital to treat injured or diseased fish. Always keep fish isolated long enough for complete treatment of their ailment PLUS 2 weeks after, to make sure it does not return and that the fish returns to full health.
3. Keep quarantine tank equipment completely seperate from your other tank equipment unless it is thoroughly cleaned. This includes things such as nets, decoration, and filters.
4. Unless you are medicating, perform small, but very frequent water changes. Clean water is the most important factor in disease treatment and prevention.
5. Resist the urge to keep fish in your quarantine tank. Depending on the number of tanks you own, you may not find yourself needing the tank very often. In this case, empty the tank completely between uses and keep the small HOB filter running on a larger tank to maintain the bacteria colony. However, never move a filter from a hospital tank to a main tank without cleaning it thoroughly first. Fresh media along with a little seed media from another filter should re-establish the filter. When you need the quarantine tank again, fill it with dechlorinated water of the right temperature, then add the filter and fish.
Good luck and happy fishkeeping!
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