03-25-2013, 04:48 PM
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The plastic bin like a Rubbermaid would be much better than a bathtub for reasons others have mentioned. But this falls short of what this is all for, and that is to observe the fish closely for the several weeks they are in the QT. I find it impossible to observe the fish from above in any sort of container that is not clear on the sides, and that basically means a small glass tank.
If you are keeping relatively small fish, say 4-6 inches and under, a 20g tank is sufficient for QT. Someone mentioned keeping QT and "hospital" tank separate, and I fully agree. I have a 20g permanently running with sand substrate and some plants (culls from the main tanks), with a heater and sponge filter. The heater isn't necessary until the fish are added. But this tank allows me to keep new fish in a settled environment, and I can sit and carefully observe them. They stay in this tank for at least 3 weeks, often 5-6 weeks. Sometimes several months, if they are species that may need more careful adjustment to captive life. I have had some difficult-feeding fish that have adjusted to prepared foods better in this QT than they ever would in the display tanks with competing fish and more space. In the QT I can feed more to ensure they are getting the idea and eating, and it is easier to clean up.
For a hospital, I have a 10g with just a sponge filter and heater, that is on the shelf dry until needed--which fortunately is very rare. I've only used this once in 4 years.